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Table 1 Mental retardation categories based on ICD - 10 diagnostic criteria and total difficulties and pro-social scores on SDQ

From: Problem and pro-social behavior among Nigerian children with intellectual disability: the implication for developing policy for school based mental health programs

Category Mental
Retardation
IQ
Range
Median
IQ
Mental Age Range (Years) Frequency
N (%)
Mean Total Difficulties Score on SDQ Mean Prosocial Score on SDQ
F 70 Mild 50 - 70 60 9 - 11 4 (9.1) 18.25 ± 8.85 2.25 ± 1.71
F 71 Moderate 35 - 49 42 6 - 8 27 (61.4) 13.89 ± 5.13 7.04 ± 2.39
F 72 Severe 20 - 34 27 3 - 5 11 (25.0) 11.73 ± 5.67 6.64 ± 2.25
F 73 Profound 0 - 20 10 0 - 2 2 (4.5) 12.50 ± 3.53 8.50 ± 2.12