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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)