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. 2019 Mar 28;16(7):1123. doi: 10.3390/ijerph16071123

Table 6.

Normative data (means and standard deviations) and internal consistency (α or KR-20) of the Child Relationship Development Inventory (CRC) for different raters and age-groups.

CRC MOTHERS FATHERS
AGE GROUPS n
f/m 1
Problem Frequency n
f/m 1
Problem Frequency
M (SD)
f/m 1
KR-20
f/m 1
M (SD)
f/m 1
α
f/m 1
M (SD)
f/m 1
KR-20
f/m 1
M (SD)
f/m 1
α
f/m1
Ages 2–4 176/181 1.68/1.84
(2.52)/(2.97)
0.84/0.87 25.99/27.78
(8.43)/(9.75)
0.85/0.88 133/113 1.37/1.84
(2.58)/(2.97)
0.87/0.88 27.29/29.43
(8.41)/(8.87)
0.84/0.84
Ages 5–6 156/176 1.64/1.35
(2.70)/(2.37)
0.88/0.86 25.53/26.38
(8.14)/(8.41)
0.86/0.84 95/103 1.02/1.35
(1.89)/(2.37)
0.80/0.85 26.32/26.39
(8.48)/(9.33)
0.85/0.88
Ages 7–8 254/246 1.26/1.22
(2.42)/(2.93)
0.88/0.88 23.56/23.47
(8.25)/(8.28)
0.88/0.88 122/143 1.28/1.22
(2.54)/(2.93)
0.89/0.92 22.90/24.38
(6.60)/(8.38)
0.81/0.89
Ages 9–10 183/208 1.42/1.29
(2.43)/(2.52)
0.85/0.87 23.63/24.00
(9.94)/(9.48)
0.91/0.90 104/120 0.78/1.29
(1.73)/(2.52)
0.82/0.89 23.16/24.18
(8.90)/(8.22)
0.90/0.88
Total 769/811 1.47/1.42
(2.51)/(2.73)
0.86/0.87 24.53/25.20
(8.75)/(9.12)
0.88/0.88 454/479 1.14/1.42
(2.27)/(2.73)
0.87/0.89 24.96/25.95
(8.31)/(8.90)
0.86/0.88

1 f = female; m = male.