Comparison of intraclass correlation coefficient estimates and standard errors between using cross-sectional and repeated measurement data: The Safety Check cluster randomized trial

Abstract Background: Occupational back pain is the most prevalent health problem among nurses and needs to be assessed by a valid and multi-factorial questionnaire. The purpose of the present study was to design and develop an instrument based on the PRECEDE-PROCEED model for assessing job-related behaviors that cause low back pain. Methods: First an item pool of 49 items was generated. Then, content and face validity was carried out. Consequently, a cross-sectional study was conducted in Mazandaran, Iran. The questionnaire was distributed among a sample of nurses working in hospitals affiliated to Mazandaran University of Medical Sciences. Exploratory factor analysis was used to determine the factor structure of the questionnaire. The Cronbach’s alpha was estimated to assess the reliability and the intraclass correlation coefficient was calculated to examine stability. Results: In all 155 nurses participated in the study. The mean age of respondents was 34.1 (SD = 7.66) years, and 83.2% were female. Six factors with 30 items emerged from the exploratory factor analysis: knowledge, attitude, self-efficacy, reinforcing factors, enabling factors and behavior that jointly accounted for %66.5 of behavior change variance observed. The Cronbach’s alpha coefficient showed excellent internal consistency (alpha=0.92). The intraclass correlation coefficient with 2-weeks interval also indicated that the questionnaire has satisfactory stability (ICC = 0.97). Conclusions: The findings showed that the Occupational Back Pain Prevention Behavior Questionnaire is a reliable and valid instrument for measuring occupational back pain and prevention behaviors among nurses. Keywords: Occupational Back Pain, Prevention behaviors, Psychometric evaluation, PRECEDE-PROCEED model, Nurse

Download Full-text

The Inventory of Physical Activity Barriers for Adults 50 Years and Older: Refinement and Validation

Innovation in Aging ◽

10.1093/geroni/igab046.2889 ◽

2021 ◽

Vol 5 (Supplement_1) ◽

pp. 789-789

Author(s):

Mariana Wingood ◽

Salene Jones ◽

Nancy Gell ◽

Denise Peters ◽

Jennifer Brach

Keyword(s):

Physical Activity ◽

Factor Analysis ◽

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Assessment Tool ◽

Intraclass Correlation ◽

Community Dwelling ◽

Cross Sectional ◽

Retest Reliability ◽

Test Retest Reliability

Abstract Addressing physical activity (PA) barriers is an essential component of increasing PA among the 56-73% of community-dwelling adults 50 years and older who are not performing the recommended 150 minutes of moderate-to-vigorous PA. As there is no feasible, multi-factorial tool to assess PA barriers among this population, we developed and validated a PA barrier assessment tool called the Inventory of Physical Activity Barriers (IPAB). We collected cross-sectional data on 503 adults (mean age 70.1), with 79 participants completing the scale twice for test-retest reliability and 64 completing a cross-over design examining the ability to use two administration formats interchangeably. Our analyses consisted of exploratory and confirmatory factor analysis, Cronbach alpha, intraclass correlation coefficient, Bland-Altman Plot, and t-tests. Using factor analysis, we identified and confirmed an eight-factor solution consisting of 27 items. The 27-item IPAB is internally consistent (alpha= 0.91), has a high test-retest reliability (intraclass correlation coefficient=0.99), and can differentiate between individuals who meet the recommended levels of PA and those who do not (p < 0.001). The IPAB scores ranged between 1.00-3.11 for the paper format (mean=1.78) and 1.07-3.48 for the electronic format (mean=1.78), with no statistical difference between the paper and electronic administration formats (p=0.94), resulting in the conclusion that the two administration formats can be used interchangeably. Participant feedback illustrates that the IPAB is easy to use, has clear instruction, and is an appropriate length. The newly validated IPAB scale can be used to develop individualized PA interventions that address PA barriers among patients 50 years and older.

Download Full-text

Intra- and inter-rater reliability in a comparative study of cross-sectional and spiral computed tomography pelvimetry methods

Acta Radiologica Open ◽

10.1177/2058460119855187 ◽

2019 ◽

Vol 8 (6) ◽

pp. 205846011985518 ◽

Cited By ~ 2

Author(s):

Erika Phexell ◽

Anna Åkesson ◽

Marcus Söderberg ◽

Anetta Bolejko

Keyword(s):

Computed Tomography ◽

Radiation Dose ◽

Confidence Interval ◽

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Intraclass Correlation ◽

Measurement Reliability ◽

Cross Sectional ◽

Rater Reliability ◽

Short Spiral

Background Different low-dose computed tomography (CT) pelvimetry methods can be used to evaluate the size of birth canal before delivery. CT pelvimetry might generate an acceptable low fetal radiation dose but its measurement accuracy is unknown. Purpose To investigate intra- and inter-rater measurement reliability of cross-sectional and two spiral CT pelvimetry methods: standard spiral and short spiral. Material and Methods Ten individuals (age ≥60 years, body mass index ≥30 kg/m2) having a CT scan of the abdomen also had CT pelvimetry scans. Three radiologists made independent measurements of each pelvimetry method on two occasions and also in consensus for a reference pelvimetry computed from the standard-dose CT scan of the abdomen. Inter- and intra-rater reliability was analyzed by intraclass correlation coefficient. Results Measurements in the short spiral pelvimetry demonstrated excellent intra- and inter-rater reliability, intraclass correlation coefficient ≥0.93, and good to excellent 95% confidence interval 0.87–0.99. Corresponding results of the standard spiral and cross-sectional pelvimetry showed good to excellent intraclass correlation coefficient ≥0.85 and ≥0.76, and 95% confidence interval was least good and moderate 0.73–0.98 and 0.59–0.97, respectively. Intraclass correlation coefficient between reference pelvimetry and other CT methods showed analogous results. Conclusion The short spiral pelvimetry demonstrated high and best reliability in comparison to other methods. Standard spiral method showed also good measurement reliability but the short spiral pelvimetry generates lower fetal radiation dose. This method might be suitable for measurements at narrow pelvis. Patient acceptance and attitude to CT pelvimetry should be investigated.

Download Full-text

A simple equation to estimate body fat percentage in children with overweightness or obesity: a retrospective study

PeerJ ◽

10.7717/peerj.3238 ◽

2017 ◽

Vol 5 ◽

pp. e3238 ◽

Cited By ~ 3

Author(s):

Ernesto Cortés-Castell ◽

Mercedes Juste ◽

Antonio Palazón-Bru ◽

Laura Monge ◽

Francisco Sánchez-Ferrer ◽

...

Keyword(s):

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Fat Mass ◽

Intraclass Correlation ◽

Overweight And Obesity ◽

Fat Free Mass ◽

Coefficient Of Determination ◽

Fat Percentage ◽

Mass Percentage ◽

Cross Sectional

BackgroundDual-energy X-ray absorptiometry (DXA) provides separate measurements of fat mass, fat-free mass and bone mass, and is a quick, accurate, and safe technique, yet one that is not readily available in routine clinical practice. Consequently, we aimed to develop statistical formulas to predict fat mass (%) and fat mass index (FMI) with simple parameters (age, sex, weight and height).MethodsWe conducted a retrospective observational cross-sectional study in 416 overweight or obese patients aged 4–18 years that involved assessing adiposity by DXA (fat mass percentage and FMI), body mass index (BMI), sex and age. We randomly divided the sample into two parts (construction and validation). In the construction sample, we developed formulas to predict fat mass and FMI using linear multiple regression models. The formulas were validated in the other sample, calculating the intraclass correlation coefficient via bootstrapping.ResultsThe fat mass percentage formula had a coefficient of determination of 0.65. This value was 0.86 for FMI. In the validation, the constructed formulas had an intraclass correlation coefficient of 0.77 for fat mass percentage and 0.92 for FMI.ConclusionsOur predictive formulas accurately predicted fat mass and FMI with simple parameters (BMI, sex and age) in children with overweight and obesity. The proposed methodology could be applied in other fields. Further studies are needed to externally validate these formulas.

Download Full-text

The stepped wedge cluster randomized trial always requires fewer clusters but not always fewer measurements, that is, participants than a parallel cluster randomized trial in a cross-sectional design

Journal of Clinical Epidemiology ◽

10.1016/j.jclinepi.2013.07.008 ◽

2013 ◽

Vol 66 (12) ◽

pp. 1428 ◽

Cited By ~ 18

Author(s):

Esther de Hoop ◽

Willem Woertman ◽

Steven Teerenstra

Keyword(s):

Randomized Trial ◽

Cluster Randomized Trial ◽

Stepped Wedge ◽

Cross Sectional ◽

Cross Sectional Design ◽

Cluster Randomized

Download Full-text

Correction. O. C. Ukoumunne, A comparison of confidence interval methods for the intraclass correlation coefficient in cluster randomized trialsStatistics in Medicine 2002;21: 3757–3774.

Statistics in Medicine ◽

10.1002/sim.1907 ◽

2004 ◽

Vol 23 (18) ◽

pp. 2935-2935

Author(s):

Obioha C. Ukoumunne

Keyword(s):

Confidence Interval ◽

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Intraclass Correlation ◽

Interval Methods ◽

Cluster Randomized

Download Full-text

Persistent and Emerging Pneumococcal Carriage Serotypes in a Rural Gambian Community After 10 Years of Pneumococcal Conjugate Vaccine Pressure

Clinical Infectious Diseases ◽

10.1093/cid/ciaa856 ◽

2020 ◽

Author(s):

Effua Usuf ◽

Christian Bottomley ◽

Rebecca Gladstone ◽

Ebrima Bojang ◽

Kaddijatou Jawneh ◽

...

Keyword(s):

Randomized Trial ◽

Pneumococcal Conjugate Vaccine ◽

Age Groups ◽

Genomic Analysis ◽

Cluster Randomized Trial ◽

Older Children ◽

Cross Sectional ◽

Conjugate Vaccines ◽

Pneumococcal Carriage ◽

Cluster Randomized

Abstract Background The continuing impact of pneumococcal conjugate vaccines (PCVs) in regions with high pneumococcal transmission is threatened by the persistence of vaccine serotypes (VTs) and the emergence of nonvaccine serotypes (NVTs). Methods In 2016, we conducted a cross-sectional carriage survey (CSS5) in a community where PCV7 was first introduced in 2006 during a cluster-randomized trial conducted before nationwide introduction of PCV7 (2009) and PCV13 (2011). We estimated prevalence of PCV13 VT and NVT by age and compared these with earlier surveys before (CSS0), during (CSS1-3), and after the trial but before PCV13 (CSS4). Genomic analysis was conducted for the nontypeable pneumococci. Results Prevalence of PCV13 VT carriage decreased during the 10 years between CSS0 and CSS5 across all age groups (67.6% to 13.5%, P < .001; 59.8% to 14.4%, P < .001; 43.1% to 17.9%, P < .001; and 24.0% to 5.1%, P < .001, in <2, 2–4, 5–14, and ≥15 years, respectively). However, there was no difference between CSS4 and CSS5 in children ≥2 years and adults (children <2 years, no data). The prevalence of PCV13 NVT increased between CSS0 and CSS5 for children <2 years but decreased in older children and adults. In CSS5, serotypes 3, 6A, and 19F were the most common VT and nontypeable isolates were the most common NVT. Among nontypeable isolates, 73.0% lost the ability to express a capsule. Of these, 70.8% were from a VT background. Conclusions The decrease in PCV13 VT that has occurred since the introduction of PCV13 appears to have plateaued. Significant carriage of these serotypes remains in all age groups.

Download Full-text

Agreement of body weight of older adults measured on digital chair scale and mechanical platform scale

Revista de Nutrição ◽

10.1590/1678-9865202134e200203 ◽

2021 ◽

Vol 34 ◽

Author(s):

Maria Luiza Freitas ANNES ◽

Fernanda Beck TABAJARA ◽

Rosane Dias da ROSA ◽

Rita MATTIELLO ◽

Ana Luisa Sant’Anna ALVES ◽

...

Keyword(s):

Older Adults ◽

Correlation Coefficient ◽

Intraclass Correlation Coefficient ◽

Intraclass Correlation ◽

University Hospital ◽

Scale Model ◽

Average Weight ◽

Altman Plot ◽

Cross Sectional ◽

Bland Altman Plot

ABSTRACT Objective The aim of the study was to evaluate the agreement between the weight of older adults measured on a chair scale and a platform scale. Methods This is a cross-sectional study. We evaluated 131 older adults (?60 years old), walk-in patients, admitted to a university hospital. Weight was measured on a digital chair scale model MS5811 (Charder® brand) and after on a mechanical platform scale (Filizola® brand). For the agreement analysis, the intraclass correlation coefficient and the Bland-Altman plot were used. Results Most of the sample consisted of males individuals (57.3%; n= 75). The average age was 70.47±7.59 years (60-96 years old). Measured by both methods, weight showed normal distribution. The average weight measured was 67.99±14.03 kg on the chair scale and 68.04±14.02 kg on the platform scale. The intraclass correlation coefficient of weight measured by the two methods was 1.00 (IC95%=1.00-1.00; p<0.001). In the Bland-Altman plot, the mean bias for the weight measured on the chair scale and the platform scale was 0.049 (IC95%=-0.011 to 0.110; p=0.1084). Conclusions The agreement between the weight measured on a chair scale and on a platform scale was almost excellent. Thus, the chair scale can be used as an alternative method of measuring weight, especially in the older adults with postural instability, mobility restrictions or immobility syndrome.

Download Full-text