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Table 4 Descriptive statistics, Cronbach’s alpha coefficient, ICC, SEM, and MDC for the BABAQ

From: The Back-care Behavior Assessment Questionnaire (BABAQ) for schoolchildren: development and psychometric evaluation

Subscale [number of items] Possible score range Mean (SD) Cronbach’s alpha ICC SEM MDC
Skills [23] 0–46 13.09 (14.56) 0.97 0.78 4.96 13.74
Knowledge [10] 0–10 4.56 (1.44) 0.96 0.76 0.72 1.99
Self-Efficacy [4] 4–16 11.74 (3.05) 0.93 0.83 1.42 3.94
Expectation beliefs [6] 6–30 20.43 (4.84) 0.94 0.80 2.49 6.90
Behavior [6] 6–30 21.89 (5.22) 0.95 0.83 2.33 6.46
Total [49] 16–132 72.28 (16.96) 0.93 0.84 7.08 19.62
  1. ICC Intraclass correlation coefficient, SEM Standard error of measurement, MDC Minimal detectable change