| Back pain group | No back pain group |  | ||
---|---|---|---|---|---|
 | n | Mean (SD) or n (%) | n | Mean (S.D.) or n (%) | p value |
AA in early pregnancy (°) | 16 | 44.1 (6.3) | 154 | 39.7 (7.0) | 0.019 |
AA pp – AA early pregnancy (°) | 16 | 1.0 (7.1) | 150 | 1.8 (5.0) | 0.69 |
Age (yr) | 16 | 29.1 (5.5) | 155 | 27.7 (4.4) | 0.25 |
Weight (kg) | 16 | 67.0 (6.9) | 154 | 63.4 (8.9) | 0.12 |
Height (m) | 16 | 1.66.1 (0.05) | 153 | 1.66 (0.06) | 0.86 |
Body mass index (kg/m2) | 16 | 24.4 (2.8) | 153 | 22.9 (2.9) | 0.06 |
Cigarette smoking (%) | 16 | 12 (2/16) | 155 | 23 (35/155) | 0.18 |
No. of previous pregnancies | 16 | 1.6 (1.1) | 154 | 0.8 (0.8) | 0.0006 |
No. of previous deliveries | 16 | 1.0 (0.8) | 154 | 0.46 (0.6) | 0.002 |
Time since previous delivery (yr) | 11 | 3.5 (3.7) | 60 | 3.3 (3.7) | 0.88 |
Previous back pain, not in pregnancy (%) | 16 | 44 (7/16) | 155 | 57 (88/155) | 0.13 |
Back pain in previous pregnancy (%) | 13 | 77 (10/13) | 89 | 34 (30/89) | 0.003 |