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Table 2 OCD-CA parent form and self-report form: Cronbach’s alphas (α) and item-total correlations, CLIN, {OCDS}, (COS)

From: Psychometric evaluation of a parent-rating and self-rating inventory for pediatric obsessive-compulsive disorder: German OCD Inventory for Children and Adolescents (OCD-CA)

Scale Parent form Self-report form
6–10 years old 11–18 years old 11–18 years old
α Item-total r α Item-total r α Item-total r
Contamination & Washing (9 items) .91 {.91} .55–.83 {.49-.83} .94 {.93} (.85) .62–.89 {.54–.87} (.47–.69) .89 {.88} (.78) .55–.71 {.54–.72} (.31–.60)
Catastrophes & Injuries (11 items) .88 {.88} .42–.76 {.35-.76} .87 {.85} (.84) .25–.74 {.16–.73} (.28–.73) .87 {.87} (.82) .43–.71 {.41–73} (.36–.64)
Checking (7 items) .80 {.83} .33–.67 {40-.69} .82 {.81} (.80) .43-.68 {.37–.68} (.31–.64) .78 {.79} (.74) .41–.62 {.40–.64} (.34–.55)
Ordering & Repeating (5 items) .78 {.74} .49–.67 {.33-.63} .84 {.80} (.77) .60–.75 {.53–.69} (.48–.63) .74 {.70} (.55) .49–.54 {.43–.53} (.11–.49)
OCD Total (36 items) .92 {.90} .18–.69 {.18-.71} .93 {.88} (.93) .18-.67 {.08-.54} (.23–.66) .93 {.92} (.91) .35–.68 {.29–.66} (.14–.61)
  1. Parent-report form: 6–10 years old: n = 110, {n = 46}; 11–18 years old: n = 232, {n = 134}, (n = 367)
  2. Self-report form: n = 218, {n = 134}, (n = 367)