Table 1

Descriptive statistics

VariableParents of children who have a DD who were born 1990–1995Parents of typical children who were born 1990–1995Parents of children who have a DD who were born 2000–2005Parents of typical children who were born
2000–2005
Total number of parents with postbirth data16 659596 54511 294344 800
Number of mothers (n (per cent of total parents))9378 (56.30)316 390 (53.04)5957 (52.74)180 918 (52.47)
Number of fathers7281280 1555337163 882
Mean number of children in the family (n (SD))1.06 (0.24)
Range 1–5
1.12 (0.41)
Range 1–7
1.32 (0.47)
Range 1–5
1.22 (0.46)
Range 1–5
Mean age at birth of reference child
 Mothers (n (SD))30.01 (5.98)30.31 (5.50)31.31 (6.14)30.37 (5.39)
 Fathers (n (SD))32.29 (6.69)32.67 (6.17)33.80 (6.59)32.91 (5.94)
Income quintile of the reference child at birth
 Lowest (n (%))1169 (27.10)57 527 (22.08)1193 (25.16)49 542 (21.77)
 Second (n (%))914 (21.19)55 449 (21.28)1017 (21.47)48 413 (21.28)
 Third (n (%))812 (18.82)53 388 (20.49)957 (20.21)46 452 (20.42)
 Fourth (n (%))759 (17.59)50 919 (19.54)849 (17.93)44 057 (19.36)
 Highest (n (%))660 (15.30)43 264 (16.61)720 (15.20)39 074 (17.17)
Mothers with a postbirth diagnosis of depression (n (%))6999 (74.63)193 370 (61.12)3721 (62.46)93 708 (51.80)
Mothers with a postbirth diagnosis of a mental health problem (other than depression) (n (%))6133 (65.40)159 100 (50.29)3022 (50.73)70 193 (38.80)
Fathers with a postbirth diagnosis of depression (n (%))3987 (54.76)119 271 (42.57)1986 (37.21)49 737 (30.35)
Fathers with a postbirth diagnosis of a mental health problem (other than depression) (n (%))3551 (48.77)106 815 (38.13)1724 (32.30)43 265 (26.40)
  • DD, developmental disability.