scholarly journals Effect of Duration of Use of a Toothbrush on its Filament’s Tapering and Plaque Removal Efficacy

2020 ◽  
Vol 14 (1) ◽  
pp. 384-389
Author(s):  
Parichehr Behfarnia ◽  
Seyedeh Marzieh Hasheminejad ◽  
Mozhgan Izadi ◽  
Nahid Shahin ◽  
Zahra Sepahi ◽  
...  
Keyword(s):  
Correlation Coefficient ◽  
T Test ◽  
Pearson’S Correlation Coefficient ◽  
Plaque Removal ◽  
Pearson's Correlation ◽  
Pearson's Correlation Coefficient ◽  
Toothbrush Wear ◽  
Spearman’S Correlation ◽  
Paired T Test

Background and Objectives: Dental professionals often recommend changing toothbrushes every three months due to their wear and decreased plaque removal efficacy. This study aimed to assess the correlation of duration of use of a toothbrush and its wear and then the relationship of wear of toothbrush and Plaque Index (PI) of users and tapering of toothbrush filaments after three months of use was evaluated as well. Materials and Methods: In this study, 60 female students were enrolled according to the eligibility criteria and received a new set of toothbrush and toothpaste. They were requested to brush their teeth using the Bass technique twice a day for 2 minutes and the Ramfjord PI was measured at baseline and after 3 months. The wear of 47 toothbrushes after three months of use was evaluated using the Rawls index. Of collected 47 toothbrushes, 30 were randomly chosen and inspected under an electron microscope to determine the degree of tapering of bristles. Data were analyzed using SPSS version 20 via Spearman’s correlation coefficient, paired t-test and Pearson’s correlation coefficient (alpha=0.05). Results: After 3 months, the mean PI score significantly decreased (paired t-test, P=0.034). The PI at 3 months after use had no significant correlation with the toothbrush wear score (Spearman’s correlation coefficient, P=0.61) but the toothbrush wear score had a significant correlation with tapering of bristles (Spearman’s correlation coefficient, P=0.04). No significant association existed between PI at 3 months after use and tapering of bristles (Pearson’s correlation coefficient, P=0.69). Conclusion: The duration of use and wear of toothbrush alone do not affect the quality of plaque removal. Practicing Oral hygiene can affect the quality of plaque removal.

scholarly journals The Effect of SPAWN Strategy in Developing Persuasive Writing Skills and Productive Habits of Mind

2020 ◽  
Author(s):  
Amal Musaed Alkthery ◽  
Dalal Abdullah Al-Qiawi
Keyword(s):  
Correlation Coefficient ◽  
Writing Skills ◽  
Persuasive Writing ◽  
T Test ◽  
Habits Of Mind ◽  
Pearson’S Correlation Coefficient ◽  
Eta Squared ◽  
Pearson's Correlation ◽  
Pearson's Correlation Coefficient ◽  
Experimental Group

This research investigated the effect of SPAWN strategy in developing persuasive writing skills and productive habits of mind in the English language among second secondary grade students. The study adopted the quasi-experimental design, which involves two groups: experimental and control. For data collection, the researcher designed the following instruments and materials: the teacher's guide to teach persuasive writing and develop productive habits of mind by using SPAWN strategy, persuasive writing skills test and rubric, and the productive habits of mind scale. These instrument were applied to a sample of sixty students in the second secondary grade. Data were analyzed through Pearson's correlation coefficient, independent samples t-test, paired-samples t-test, and ETA squared. The findings revealed statistically significant differences between the mean scores of the experimental and the control groups in the post-administration of persuasive writing test and productive habits of mind scale in favor of the experimental group. Also, the results obtained through the paired-sample t-test and the Eta squared showed that the experimental group students achieved significantly higher scores in the post-tests. Besides, Pearson's correlation coefficient revealed the strong positive correlation between persuasive writing skills and the four selected productive habits of mind, which are: Thinking flexibly, Questioning and Problem posing, Apply prior knowledge to new situations, Creating Imagining and Innovating. In recommended , include the persuasive writing skills in second secondary grade students' textbook and teachers' guide to help teach, develop and evaluate students' persuasive writing skills effectively. Besides, including the procedures of SPAWN strategy in the teachers' manual to enhancing students persuasive writing and promote productive habits of mind.

scholarly journals The Correlation of Perceived Stress and Insomnia Severity in Postmenopausal Women

2020 ◽  
Vol 24 (2) ◽  
Author(s):  
Maryam Masoudi ◽  
Hamzeh Ahmadian ◽  
Maryam Akbari ◽  
Nasrin Jalilian
Keyword(s):  
Quality Of Life ◽  
Postmenopausal Women ◽  
Correlation Coefficient ◽  
Perceived Stress ◽  
Pearson’S Correlation Coefficient ◽  
Pearson's Correlation ◽  
Pearson's Correlation Coefficient ◽  
Insomnia Severity ◽  
Score Range

Background: Postmenopausal women experience tremendous changes that are not only hormonal, but also social and emotional, which reduce their quality of life. Limited research has been focused on perceived stress and the influential factors in women during menstruation. Objectives: The present study aimed to assess the correlation between perceived stress and insomnia severity in postmenopausal women. Methods: This cross-sectional study was conducted on 190 postmenopausal women referring to the healthcare centers in Kermanshah, Iran in 2019. Data were collected using the individual and sociodemographic questionnaire, perceived stress scale, and insomnia severity index. Data analysis was performed in SPSS using independent t-test, one-way ANOVA, and Pearson’s correlation-coefficient to evaluate the correlation between perceived stress and insomnia severity. Results: The total mean score of perceived stress was 33.9 ± 13.8 (score range: 7 - 54), and the total mean score of insomnia was 15.1 ± 4.8 (score range: 6 - 28). The comparison of the total mean score of perceived stress showed a significant difference at various severities of insomnia (F [3, 186] = 12.31; P < 0.0001). According to the post-hoc results, the women with severe insomnia obtained the highest mean score of perceived stress compared to those with normal, mild, and moderate insomnia. Furthermore, the Pearson’s correlation-coefficient was indicative of a significant association between insomnia severity and the total score of perceived stress (r = 0.417; P < 0.0001). In other words, the women with higher scores of insomnia severity achieved higher scores of perceived stress comparatively. Conclusions: Insomnia and perceived stress are common and correlated in postmenopausal women. Therefore, the identification and treatment of postmenopausal women with stress and sleep disorders could remarkably improve their quality of life.

scholarly journals Case Study of Anaerobic Digestion Process Stability Detected by Dissolved Hydrogen Concentration

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 106
Author(s):  
Daniela Platošová ◽  
Jiří Rusín ◽  
Jan Platoš ◽  
Kateřina Smutná ◽  
Roman Buryjan
Keyword(s):  
Anaerobic Digestion ◽  
Correlation Coefficient ◽  
Hydrogen Concentration ◽  
Pearson’S Correlation ◽  
Pearson’S Correlation Coefficient ◽  
Digestion Process ◽  
Short Service Life ◽  
Pearson's Correlation ◽  
Dissolved Hydrogen ◽  
Pearson's Correlation Coefficient

The paper presents the results of a laboratory experiment of mesophilic single-stage anaerobic digestion performed to verify the possibility of early detection of process instability and reactor overload by evaluating the course of dissolved hydrogen concentration of the main intermediate. The digestion process was run in a Terrafors IS rotary drum bioreactor for 230 days. The substrate dosed on weekdays was food leftovers from the university canteen. At an average temperature of 37 °C, an organic loading of volatiles of 0.858 kg m−3 day−1 and a theoretical retention time of 259 days, biogas production of 0.617 Nm3 kg VS−1 was achieved with a CH4 content of 51.7 vol. %. The values of the established FOS/TAC stability indicator ranged from 0.26 to 11.4. The highest value was reached when the reactor was overloaded. The dissolved hydrogen concentration measured by the amperometric microsensor ranged from 0.039–0.425 mg dm−3. Data were statistically processed using Pearson’s correlation coefficient. The correlation of the hydrogen concentration with other parameters such as the concentration of organic acids was evaluated. The value of Pearson’s correlation coefficient was 0.331 and corresponded to a p-value of 0. The results confirmed a very low limit of the hydrogen concentration at which the microbial culture, especially methanogens, was already overloaded. The amperometric microsensor proved to be rather unsuitable for operational applications due to insufficient sensitivity and short service life. The newly designed ratio of dissolved hydrogen concentration to neutralizing capacity was tested but did not work significantly better than the established FOS/TAC stability indicator.

Italian version of the cornell musculoskeletal discomfort questionnaire (CMDQ-I): Translation, cultural adaptation and validation

Work ◽  
2021 ◽  
pp. 1-7
Author(s):  
F. Magnifica ◽  
F. Colagrossi ◽  
A. Aloisi ◽  
S. Politi ◽  
A. Peretti ◽  
...  
Keyword(s):  
Correlation Coefficient ◽  
Cultural Adaptation ◽  
Italian Version ◽  
Cronbach’S Alpha ◽  
Musculoskeletal Discomfort ◽  
Pearson’S Correlation ◽  
Pearson’S Correlation Coefficient ◽  
Cronbach's Alpha ◽  
Pearson's Correlation ◽  
Pearson's Correlation Coefficient

BACKGROUND: Almost 25%of workers in the European Union suffer from back pain, and 23%complain of muscle pain. Sixty-two percent of workers carry out repetitive operations with their hands or arms, 46%work in painful or tired positions and 35%carry or handle loads. OBJECTIVE: This study aimed to translate, culturally adapt and validate the Italian version of the Cornell Musculoskeletal Discomfort Questionnaire (CMDQ-I). METHODS: Translation and cultural adaptation procedures followed international guidelines. Participants were recruited from among the personnel components of the Italian Air Force, who were between 18 and 65 years old. Cronbach’s alpha and the intraclass correlation coefficient (ICC) were calculated to assess internal consistency and stability, respectively. The CDMQ-I was administered together with the Visual Analogic Scale (VAS), and the validity was evaluated using Pearson’s correlation coefficient. RESULTS: All CDMQ-I items were either identical or similar in meaning to the original version’s items. The scale was administered twice with a retest after seven to 10 days to 66 participants. Cronbach’s alpha was higher than 0.761, and the ICC ranged between 0.737 and 0.952. Pearson’s correlation coefficient showed positive and significant correlations (p >  0.01). CONCLUSIONS: The study produced an Italian version of the CMDQ with good reliability and validity. This scale is a useful tool to investigate the frequency and intensity of musculoskeletal disorders in various categories of workers.

scholarly journals Suitable Docking Protocol for the Design of Novel Coumarin Derivatives with Selective MAO-B Effects

2021 ◽  
Vol 1 (1) ◽  
pp. 40-47
Author(s):  
Emilio Viktorov Mateev ◽  
Iva Valkova ◽  
Maya Georgieva ◽  
Alexander Zlatkov
Keyword(s):  
Correlation Coefficient ◽  
Scoring Functions ◽  
Pearson’S Correlation ◽  
Chain Flexibility ◽  
Pearson’S Correlation Coefficient ◽  
Pairwise Correlation ◽  
Mao B ◽  
Docking Protocol ◽  
Pearson's Correlation ◽  
Pearson's Correlation Coefficient

Recently, the application of molecular docking is drastically increasing due to the rapid growth of resolved crystallographic receptors with co-crystallized ligands. However, the inability of docking softwares to correctly score the occurred interactions between ligands and receptors is still a relevant issue. This study examined the Pearson’s correlation coefficient between the experimental monoamine oxidase-B (MAO-B) inhibitory activity of 44 novel coumarins and the obtained GOLD 5.3 docking scores. Subsequently, optimization of the docking protocol was carried out to achieve the best possible pairwise correlation. Numerous modifications in the docking settings such as alteration in the scoring functions, size of the grid space, presence of active waters, and side-chain flexibility were conducted. Furthermore, ensemble docking simulations into two superimposed complexes were performed. The model was validated with a test set. A significant Pearson’s correlation coefficient of 0.8217 was obtained for the latter. In the final stage of our work, we observed the major interactions between the top-scored ligands and the active site of 1S3B.

scholarly journals DNA typing of the gastric mucosa of patients with chronic duodenal ulcer

2021 ◽  
Vol 11 (11) ◽  
pp. 221-230
Author(s):  
A. Kharchenko ◽  
A. Yelinska
Keyword(s):  
Duodenal Ulcer ◽  
Gastric Mucosa ◽  
Correlation Coefficient ◽  
Strong Correlation ◽  
Dna Typing ◽  
Pearson’S Correlation Coefficient ◽  
Chronic Duodenal Ulcer ◽  
Pearson's Correlation ◽  
Pearson's Correlation Coefficient ◽  
Issr Pcr

The work involved a molecular biological technique (ISSR-PCR) using ISSR-primer S-2, with structure (AGC) 6G. Changes in the gastric mucosa in chronic duodenal ulcer disease against the background of severe chronic atrophic gastritis have been analyzed. Noteworthy is the fact that there is a strong correlation between the degree of dysplasia of the epithelium of the gastric mucosa and the mitotic index, the Pearson's correlation coefficient rxy was 0.853, respectively. A strong and very strong correlation relationship between the indicators of the degree of dysplasia of the epithelium of the gastric mucosa by phenotypic characteristics and indicators of DNA typing of samples of the gastric mucosa, the Pearson's correlation coefficient rxy was 0.863, respectively. DNA profiles of the gastric mucosa of patients with duodenal ulcer according to the results of typing by the ISSR-PCR method ranging from 520 to 620 bp. had the character of microsatellite expansions and differed from the profile of the norm, which is evidence of precancerous changes.

scholarly journals Validation of a Water Vapor Micropulse Differential Absorption Lidar (DIAL)

2016 ◽  
Vol 33 (11) ◽  
pp. 2353-2372 ◽  
Author(s):  
Tammy M. Weckwerth ◽  
Kristy J. Weber ◽  
David D. Turner ◽  
Scott M. Spuler
Keyword(s):  
Water Vapor ◽  
Correlation Coefficient ◽  
Microwave Radiometer ◽  
Temporal Trends ◽  
Differential Absorption ◽  
Differential Absorption Lidar ◽  
Pearson’S Correlation ◽  
Pearson’S Correlation Coefficient ◽  
Pearson's Correlation ◽  
Pearson's Correlation Coefficient

AbstractA water vapor micropulse differential absorption lidar (DIAL) instrument was developed collaboratively by the National Center for Atmospheric Research (NCAR) and Montana State University (MSU). This innovative, eye-safe, low-power, diode-laser-based system has demonstrated the ability to obtain unattended continuous observations in both day and night. Data comparisons with well-established water vapor observing systems, including radiosondes, Atmospheric Emitted Radiance Interferometers (AERIs), microwave radiometer profilers (MWRPs), and ground-based global positioning system (GPS) receivers, show excellent agreement. The Pearson’s correlation coefficient for the DIAL and radiosondes is consistently greater than 0.6 from 300 m up to 4.5 km AGL at night and up to 3.5 km AGL during the day. The Pearson’s correlation coefficient for the DIAL and AERI is greater than 0.6 from 300 m up to 2.25 km at night and from 300 m up to 2.0 km during the day. Further comparison with the continuously operating GPS instrumentation illustrates consistent temporal trends when integrating the DIAL measurements up to 6 km AGL.

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