| Intervention group n = 1332 | Comparison group n = 1234 |  | ||
---|---|---|---|---|---|
n | Mean (S.D.) (%) | n | Mean (S.D.) (%) | P-value | |
Maternal factors | |||||
 Age (years) | 1166 | 30.41 (4.64) | 995 | 30.13 (4.84) | 0.541 |
 Short education | 1164 | (42%) | 983 | (37%) | 0.152 |
 Single living | 1156 | (4%) | 983 | (4%) | 0.932 |
 Parity first-time | 1150 | (45%) | 976 | (48%) | 0.322 |
 Parenting Confidence Scale (KPCS)a < 40 | 1088 | (24%) | 926 | (21%) | 0.112 |
 Major Depression Inventory (MDI)b > 14 | 1084 | (9%) | 914 | (8%) | 0.472 |
Infant factors | |||||
 Preterm (less than 37 gestational weeks) | 1150 | (3%) | 976 | (4%) | 0.332 |
 Age & Stages Questionnaire: (ASQ:SE)b > 24 | 1109 | (56%) | 918 | (53%) | 0.102 |
 Average Age & Stages Questionnaire: (ASQ:SE)b | 1095 | 1.67 (0.91) | 932 | 1.63 (0.90) | 0.231 |
Relationship factors | |||||
 Mother and Baby Interaction Scale (MABISC)b | 1085 | 8.48 (4.29) | 909 | 8.35 (4.28) | 0.461 |