From: Prediction of uncomplicated pregnancies in obese women: a prospective multicentre study
 | Least likely to have an uncomplicated pregnancy and birth |  |  | Most likely to have an uncomplicated pregnancy and birth |  |  |
---|---|---|---|---|---|---|
 | 1st fifth(n = 181) | 2nd fifth(n = 181) | 3rd fifth(n = 182) | 4th fifth(n = 181) | 5th fifth(n = 182) | P value |
Uncomplicated pregnancy (%) | 22 (12.2) | 34 (18.8) | 58 (31.9) | 75 (41.4) | 114 (62.6) | < 0.001 |
Antenatal outcomes (%) | ||||||
 Miscarriagea | 2 (1.1) | 2 (1.1) | 1 (0.5) | 3 (1.7) | 0 (0) | 0.51 |
 Preterm delivery | 11 (6.1) | 16 (8.9) | 6 (3.3) | 7 (3.9) | 5 (2.7) | 0.04 |
 Gestational diabetes | 77 (43) | 50 (27.9) | 57 (31.5) | 35 (19.7) | 29 (15.9) | < 0.001 |
 Preeclampsia | 12 (6.7) | 13 (7.3) | 6 (3.3) | 3 (1.7) | 6 (3.3) | 0.04 |
 Other hypertensive disorders | 16 (8.9) | 12 (6.7) | 13 (7.2) | 9 (5.1) | 2 (1.1) | 0.02 |
 Antepartum haemorrhage | 11 (6.1) | 4 (2.2) | 8 (4.4) | 12 (6.7) | 3 (1.6) | 0.06 |
 Placental abruption | 2 (1.1) | 0 (0) | 1 (0.6) | 1 (0.6) | 2 (1.1) | 0.68 |
 Venous thromboembolism | 0 (0) | 1 (0.6) | 0 (0) | 0 (0) | 0 (0) | 0.40 |
 Small for gestational age | 26 (14.5) | 31 (17.3) | 18 (9.9) | 18 (10.1) | 18 (9.9) | 0.10 |
 Large for gestational age | 16 (8.9) | 11 (6.1) | 18 (9.9) | 17 (9.6) | 18 (9.9) | 0.69 |
 Stillbirth | 2 (1.1) | 0 (0) | 1 (0.6) | 1 (0.6) | 1 (0.5) | 0.73 |
Labour outcomes (%) | ||||||
 Induction of labour | 95 (52.0) | 76 (42.5) | 60 (33.1) | 45 (25.3) | 51 (28.0) | < 0.001 |
 Elective caesarean section | 41 (22.9) | 22 (12.3) | 34 (18.8) | 41 (23.0) | 44 (24.2) | 0.03 |
 Mode of delivery (in labour) |  |  |  |  |  |  |
  Spontaneous vaginal | 56 (40.6) | 76 (48.4) | 94 (63.9) | 105 (76.6) | 127 (92.0) | < 0.001 |
  Instrumental delivery | 27 (19.6) | 35 (22.3) | 21 (14.3) | 16 (11.7) | 3 (2.2) | < 0.001 |
  Emergency CS | 55 (39.9) | 46 (29.3) | 32 (21.8) | 16 (11.7) | 8 (5.8) | < 0.001 |
 Postpartum haemorrhage | 44 (24.6) | 28 (15.6) | 27 (14.9) | 20 (11.2) | 16 (8.8) | < 0.001 |
 Apgar < 7 at 5 min | 6 (3.4) | 4 (2.2) | 2 (1.1) | 4 (2.2) | 3 (1.6) | 0.66 |
 NICU admission | 19 (10.6) | 20 (11.2) | 15 (8.3) | 12 (6.7) | 10 (5.5) | 0.24 |
 Neonatal death | 1 (0.6) | 1 (0.6) | 0 (0) | 0 (0) | 1 (0.5) | 0.74 |