Table 4.
Family background characteristics of intact and separated European ancestry families, by quintile of predicted probability of parental separation.
| Predicted Probability of Parental Separation |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 0-20%ile | 21-40%ile | 41-60%ile | 61-80%ile | >80%ile | ||||||
| Intact (n = 262) | Separated (n = 29) | Intact (n = 245) | Separated (n = 47) | Intact (n = 197) | Separated (n = 91) | Intact (n = 159) | Separated (n = 130) | Intact (n = 60) | Separated (n = 224) | |
| Paternal alcoholism, n (%) | 4 (2) | 0 (0) | 9 (4) | 1 (2) | 15 (8) | 4 (4) | 37 (23) | 32 (25) | 37 (62) | 169 (75)* |
| Maternal alcoholism, n (%) | 4 (2) | 0 (0) | 4 (2) | 2 (4) | 2 (1) | 0 (0) | 6 (4) | 7 (5) | 8 (13) | 35 (16) |
| Maternal smoking, n (%) | 56 (21) | 7 (24) | 124 (51) | 33 (70)* | 105 (53) | 54 (59) | 115 (72) | 85 (65) | 53 (88) | 177 (80) |
| Maternal age at twins’ birtha, n (%) | ||||||||||
| < 20 | 1 (0.004) | 0 (0) | 1 (0.004) | 1 (2) | 0 (0) | 0 (0) | 11 (7) | 15 (12) | 16 (27) | 54 (24) |
| 20-24 | 11 (5) | 0 (0) | 47 (19) | 3 (6)* | 65 (33) | 30 (33) | 68 (43) | 59 (45) | 19 (32) | 78 (35) |
| ≥ 35 | 49 (19) | 6 (21) | 13 (5) | 3 (6) | 6 (3) | 1 (1) | 4 (3) | 4 (3) | 3 (5) | 3 (1) |
| Paternal educational attainmentb, n (%) | ||||||||||
| < 12 years | 2 (0.008) | 1 (3) | 3 (1) | 2 (4) | 18 (9) | 10 (11) | 30 (19) | 23 (18) | 15 (25) | 61 (27) |
| ≥ 13 years | 248 (95) | 27 (93) | 153 (62) | 32 (68) | 81 (41) | 38 (42) | 43 (27) | 28 (22) | 9 (15) | 38 (17) |
Note. Within quintile, intact and separated families differ significantly at
*
p < .05
†p < 0.10.
a
Reference group = ages 25-34.
b
Reference group = 12 years.