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Table 1 Maternal demographic characteristics in relation to age group and parity

From: Preterm birth and reduced birthweight in first and second teenage pregnancies: a register-based cohort study

  Women aged 14-17 Women aged 18-19 Women aged 20-29
  First births (n = 3065) n(%) Second births (n = 571) n(%) First births (n = 5316) n(%) Second births (n = 2190) n(%) First births (n = 22710) n(%) Second births (n = 22501) n(%)
Social deprivation score       
1 (least deprived) 242 (7.88) 31 (5.43) 532 (10.01) 134 (6.12) 4406 (19.40) 3582 (15.92)
2 587 (19.12) 107 (18.74) 1043 (19.62) 371 (16.94) 5553 (24.45) 4907 (21.81)
3 844 (27.49) 158 (27.67) 1517 (28.54) 610 (27.85) 5357 (23.59) 5798 (25.77)
4 (most deprived) 1062 (34.59) 215 (37.65) 1634 (30.74) 847 (38.68) 5095 (22.44) 6051 (26.89)
unclassified 335 (10.91) 60 (10.51) 590 (11.10) 228 (10.41) 2299 (10.12) 2163 (9.61)
Ethnicity       
White 2520 (82.08) 479 (83.89) 4087 (76.88) 1767 (80.68) 15218 (67.01) 15455 (68.69)
Asian 55 (1.79) 12 (2.10) 286 (5.38) 93 (4.25) 2394 (10.54) 2634 (11.71)
Indian 8 (0.26) 1 (0.18) 71 (1.34) 22 (1.00) 889 (3.91) 721 (3.20)
Black 90 (2.93) 11 (1.93) 115 (2.16) 57 (2.60) 683 (3.01) 642 (2.85)
Chinese 4 (0.13) 2 (0.35) 11 (0.21) 5 (0.23) 145 (0.64) 96 (0.43)
Other and not recorded 393 (12.80) 66 (11.56) 746 (14.03) 246 (11.23) 3381 (14.89) 2953 (13.12)
BMI       
Normal (18.5-24.9) 1381 (44.98) 248 (43.43) 2196 (41.31) 862 (39.36) 8463 (37.27) 7640 (33.95)
Underweight (12-18.4) 144 (4.69) 15 (2.63) 229 (4.31) 81 (3.70) 559 (2.46) 547 (2.43)
Overweight (25-29.9) 359 (11.69) 88 (15.41) 757 (14.24) 341 (15.57) 3830 (16.86) 3990 (17.73)
Obese (30-39.9) 116 (3.78) 28 (4.90) 309 (5.81) 160 (7.31) 2028 (8.93) 2453 (10.90)
Morbidly obese (> 40) 9 (0.29) 1 (0.18) 23 (0.43) 18 (0.82) 207 (0.91) 307 (1.36)
Missing 1061 (34.56) 191 (33.45) 1802 (33.90) 728 (33.24) 7623 (33.57) 7564 (33.62)