Table 1 Baseline characteristics of the study population
|  | Different levels of experienced childhood maltreatment | Overall (N = 151,659) | ||
|---|---|---|---|---|
0 N = 81,372 (53.65%) | 1 N = 38,728 (25.54%) |  ≥ 2 N = 31,559 (20.81%) | ||
Birth year | ||||
 Mean (SD) | 1950 (7.66) | 1950 (7.74) | 1950 (7.77) | 1950 (7.72) |
Age at the index date, year | ||||
 Mean (SD) | 34.7 (4.83) | 34.8 (4.93) | 34.1 (4.74) | 34.6 (4.85) |
Age at recruitment, year | ||||
 Mean (SD) | 56.6 (7.67) | 56.7 (7.75) | 55.6 (7.78) | 56.5 (7.73) |
Follow-up time, year | ||||
 Mean (SD) | 31.0 (6.37) | 30.9 (6.48) | 30.1 (6.94) | 30.8 (6.53) |
Sex, No. (%) | ||||
 Female | 45,396 (55.79) | 20,755 (53.59) | 18,865 (59.78) | 85,016 (56.06) |
 Male | 35,976 (44.21) | 17,973 (46.41) | 12,694 (40.22) | 66,643 (43.93) |
Place of birth, No. (%) | ||||
 England | 65,970 (81.07) | 30,858 (79.68) | 24,893 (78.88) | 121,721 (80.26) |
 Wales | 3614 (4.44) | 1524 (3.94) | 1122 (3.56) | 6260 (4.13) |
 Scotland | 6342 (7.79) | 3061 (7.90) | 2316 (7.34) | 11,719 (7.73) |
 Elsewhere | 5394 (6.63) | 3258 (8.41) | 3196 (10.13) | 11,848 (7.81) |
 Unknown | 52 (0.06) | 27 (0.07) | 32 (0.10) | 111 (0.07) |
Ethnicity, No. (%) | ||||
 White | 76,004 (93.40) | 35,417 (91.45) | 27,872 (88.3) | 139,293 (91.85) |
 Others | 5134 (6.31) | 3172 (8.19) | 3555 (11.3) | 11,861 (7.82) |
 Unknown | 234 (0.29) | 139 (0.36) | 132 (0.4) | 505 (0.33) |
Number of siblings, No. (%) | ||||
 0 | 11,420 (14.03) | 4547 (11.74) | 3165 (10.03) | 19,132 (12.62) |
 1 | 30,888 (37.96) | 13,054 (33.71) | 9189 (29.12) | 53,131 (35.03) |
 2 | 21,027 (25.84) | 10,085 (26.04) | 8020 (25.41) | 39,132 (25.80) |
 ≥ 3 | 17,856 (21.94) | 10,957 (28.29) | 11,064 (35.06) | 39,877 (26.29) |
 Unknown | 181 (0.22) | 85 (0.22) | 121 (0.38) | 387 (0.26) |
Maternal smoking, No. (%) | ||||
 No | 53,251 (65.44) | 23,957 (61.86) | 17,384 (55.08) | 94,592 (62.37) |
 Yes | 18,426 (22.64) | 9850 (25.43) | 9802 (31.06) | 38,078 (25.11) |
 Unknown | 9695 (11.91) | 4921 (12.71) | 4373 (13.86) | 18,989 (12.52) |
Being breastfed, No. (%) | ||||
 No | 16,734 (20.56) | 8017 (20.70) | 7222 (22.88) | 31,973 (21.08) |
 Yes | 49,384 (60.69) | 22,678 (58.56) | 17,338 (54.94) | 89,400 (58.95) |
 Unknown | 15,254 (18.75) | 8033 (20.74) | 6999 (22.18) | 30,286 (19.97) |
Family history of diabetes, No. (%) | ||||
 No | 64,813 (79.65) | 30,528 (78.83) | 24,068 (76.26) | 119,409 (78.74) |
 Yes | 16,559 (20.35) | 8200 (21.17) | 7491 (23.74) | 32,250 (21.26) |