Effects of age and cognitive function on data quality of standardized surveys in nursing home populations

BMC Geriatrics

Table 2 Comparisons of mean differences in item nonresponse between MMSE-groups

Mean differences for item nonresponse rate between MMSE-groups
Adjusted comparisons of item nonresponse rates (ANCOVA)
Sample	Cognitive impairment	Mean (SE, n_valid)	Mean diff. (SE) [95% CI]	η² (F), p	δ
Pre^a	No or mild (MMSE 18–30)	4.05% (0.6, n = 213) 12.17% (1.1, n = 59)	8.13% (1.2) [5.73, 10.53]	14.2% (44.3) p < 0.001	0.82
Pre^a	Moderate (MMSE 10–17)	4.05% (0.6, n = 213) 12.17% (1.1, n = 59)	8.13% (1.2) [5.73, 10.53]	14.2% (44.3) p < 0.001	0.82
Post^a	No or mild (MMSE 18–30)	3.93% (0.5, n = 289) 11.24% (0.9, n = 75)	7.31% (1.1) [5.22, 9.40]	11.7% (47.5) p < 0.001	0.73
Post^a	Moderate (MMSE 10–17)	3.93% (0.5, n = 289) 11.24% (0.9, n = 75)	7.31% (1.1) [5.22, 9.40]	11.7% (47.5) p < 0.001	0.73
Total^b	No or mild (MMSE 18–30)	3.98% (0.4, n = 502) 11.85% (0.7, n = 134)	7.67% (0.8) [6.10, 9.24]	12.9% (92.4) p < 0.001	0.77
Total^b	Moderate (MMSE 10–17)	3.98% (0.4, n = 502) 11.85% (0.7, n = 134)	7.67% (0.8) [6.10, 9.24]	12.9% (92.4) p < 0.001	0.77

MMSE Mini-Mental State Examination, ANCOVA Analysis of Covariance; n Sample sizes, SE Standard error, 95% CI Confidence interval; F ANCOVA statistic; η² partial eta-square; δ Cohen’s d (0.20 < δ < 0.50 small, 0.50 ≤ δ < 0.80 medium, δ ≥ 0.80 large effect); ^a adjusted for sex, age, duration of interview; ^b adjusted for sample (pre-test/post-test), sex, age, interview duration; α_corr ≈ 0.0039 (k = 13)

ISSN: 1471-2318