The Effects of Non-Response on Statistical Inference

Jones, James Holland

doi:10.1300/j045v08n01_05

Cited by 57 publications

(49 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Limited overall impact is consistent with a review of the effect of nonresponse on statistical inference, which suggests that nonresponse bias is unlikely when the response rate is above 90%. 27 It should be noted, however, that a significant difference in estimates based on present students only vs all students could have been found if our survey had included a larger sample size. More generally, it has been reported that there is no ceiling for participation rates above which nonresponse bias cannot exist.…”

Section: Discussionmentioning

confidence: 86%

Comparison of Smoking, Drinking, and Marijuana Use Between Students Present or Absent on the Day of a School-Based Survey

Bovet

Viswanathan²,

Faeh³

et al. 2006

J School Health

View full text Add to dashboard Cite

The aim of this population-based survey was to compare the prevalence of selected risk behaviors between students present or absent on the day of a school-based survey. The study population was a representative sample of all students of secondary schools in the Seychelles (Indian Ocean). Students absent on the day of the survey were traced and requested to complete the same self-administered questionnaire as did present students. Self-reported consumption of cigarettes, alcohol, and marijuana were measured. Of the sample of 1453 eligible students aged 11 to 17 years, 1321 ''present students'' completed the survey (90.9% participation), 11 refused to answer all questions, and 121 were not present at school. We could trace 105 of the 121 students not present at school on the survey day (''absent students''), and all of them completed the questionnaire over the next 4 weeks. The prevalence of risk behaviors was significantly higher in absent than present students for current smoking and drinking. Inclusion of data from the absent students resulted in a relative increase in the prevalence of the considered behaviors by 3% to 8% as compared to data based on present students only. In conclusion, the prevalence of risk behaviors was higher in absent than present students. Adjusting for data of absent students increased the prevalence estimates in the base population. (J Sch Health. 2006;76(4):133-137)

show abstract

Section: Discussionmentioning

confidence: 86%

Comparison of Smoking, Drinking, and Marijuana Use Between Students Present or Absent on the Day of a School-Based Survey

Bovet

Viswanathan²,

Faeh³

et al. 2006

J School Health

View full text Add to dashboard Cite

show abstract

“…Second, formal imputation methods were not used to address the issue of missing data on incomplete clinical supervisor evaluation forms and blanks were not substituted with bestguess values. Knowledge on how assessing responders and non-responders differed would have allowed an appropriate grade imputation method to be employed (Jones 1996). In addition, the study does not provide insight into the weighting of each causal factor contributing to the findings in this study.…”

Section: Discussionmentioning

confidence: 98%

Clinical supervisor evaluations during general surgery clerkships

Wheeler

Hill

2011

Medical Teacher

View full text Add to dashboard Cite

Background: Clerkship performance is commonly evaluated by consultant surgeons who seldom supervise medical students directly. In contrast, surgical residents and interns frequently supervise students and provide essential teaching but are not tasked with evaluating them. Aim: To prospectively investigate and compare the accuracy of general surgery clerkship performance evaluations by clinical supervisors of differing seniorities. Method: Between September 2008 and May 2010, clinical supervisors of varying seniorities independently evaluated 57 fourthyear medical students using a multi-dimensional performance evaluation tool. Total evaluation grades and subtotal grades for clinical ability were correlated to the results of a validated surgical objective structured clinical examination (OSCE). Results: In this study, 85 clinical supervisors provided 427 student performance evaluations. Total evaluation grades awarded by consultant surgeons had weak correlation to student OSCE results (r ¼ 0.27, p 5 0.05) and associated subtotal grades for clinical ability had no correlation. In comparison, the equivalent sets of grades awarded by residents and interns had moderate correlations to OSCE results (r ¼ 0.49 and r ¼ 0.54, p 5 0.01). Conclusions: Validity of clinical supervisor evaluations during general surgery clerkships vary according to assessor seniority. Including performance evaluation grades by surgical residents and interns may enhance the overall validity of this common clerkship evaluation tool and improve its summative and formative assessment value.

show abstract

“…This may point to a systematic nonresponse bias (36). For this reason, laboratory data were reported separately for surveyed patients and for the greater cohort of patients who completed STS therapy.…”

Section: Discussionmentioning

confidence: 99%

Sodium Thiosulfate Therapy for Calcific Uremic Arteriolopathy

Nigwekar

Brunelli

Meade

et al. 2013

Clinical Journal of the American Society of Nephrology

186

136

View full text Add to dashboard Cite

SummaryBackground and objective Calcific uremic arteriolopathy (CUA) is an often fatal condition with no effective treatment. Multiple case reports and case series have described intravenous sodium thiosulfate (STS) administration in CUA, but no studies have systematically evaluated this treatment.Design, setting, participants, & measurements This study included 172 patients undergoing maintenance hemodialysis who had CUA and were treated with STS between August 2006 and June 2009 at Fresenius Medical Care North America. Of these, 85% completed STS therapy. Clinical, laboratory, and mortality data were abstracted from clinical information systems. Responses to survey questionnaires sent to treating physicians regarding patient-level outcomes were available for 53 patients. Effect on CUA lesions and mortality were summarized as CUA outcomes. Relevant laboratory measures, weight (using pairwise comparisons of values before, during, and after STS), and adverse events were summarized as safety parameters.Results Mean age of the cohort was 55 years, and 74% of patients were women. Median STS dose was 25 g, and median number of doses was 38. Among surveyed patients, CUA completely resolved in 26.4%, markedly improved in 18.9%, improved in 28.3%, and did not improve in 5.7%; in the remaining patients (20.8%), the response was unknown. One-year mortality in patients treated with STS was 35%. Adverse events, laboratory abnormalities, and weight-related changes were mild. Significant reductions in serum phosphorous (P=0.02) and parathyroid hormone (P=0.01) were noted during STS treatment in patients who completed the therapy.Conclusions Although conclusive evidence regarding its efficacy is lacking, a majority of patients who received STS demonstrated clinical improvement in this study.

show abstract

The Effects of Non-Response on Statistical Inference

Cited by 57 publications

References 18 publications

Comparison of Smoking, Drinking, and Marijuana Use Between Students Present or Absent on the Day of a School-Based Survey

Comparison of Smoking, Drinking, and Marijuana Use Between Students Present or Absent on the Day of a School-Based Survey

Clinical supervisor evaluations during general surgery clerkships

Sodium Thiosulfate Therapy for Calcific Uremic Arteriolopathy

Contact Info

Product

Resources

About