Early medically-induced PTB | Late medically-induced PTB | Early spontaneous PTB | Late spontaneous PTB | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Crude and adjusted models | OR | 95% C.I. | p-value | OR | 95% C.I. | p-value | OR | 95% C.I. | p-value | OR | 95% C.I. | p-value |
M1: Unadjusted | ||||||||||||
< 18.5 | 0.33 | 0.08, 1.37 | 0.13 | 0.97 | 0.51, 1.83 | 0.92 | 1.30 | 0.76, 2.20 | 0.34 | 1.33 | 0.91, 1.94 | 0.15 |
18.5-24.9 (ref) | 1.00 | 1.00 | 1.00 | 1.00 | ||||||||
25.0-29.9 | 1.95 | 1.38, 2.76 | <0.001 | 0.92 | 0.67, 1.25 | 0.59 | 1.12 | 0.85, 1.47 | 0.43 | 1.04 | 0.85, 1.28 | 0.67 |
≥ 30.0 | 2.05 | 1.40, 3.01 | <0.001 | 1.72 | 1.27, 2.31 | <0.001 | 1.34 | 0.99, 1.80 | 0.06 | 0.81 | 0.63, 1.05 | 0.11 |
M2: Adjustedc | ||||||||||||
<18.5 | 0.43 | 0.10, 1.80 | 0.25 | 1.18 | 0.61, 2.27 | 0.62 | 1.30 | 0.73, 2.30 | 0.37 | 1.46 | 0.99, 2.16 | 0.06 |
18.5-24.9 (ref) | 1.00 | 1.00 | 1.00 | 1.00 | ||||||||
25.0-29.9 | 1.68 | 1.16, 2.41 | 0.01 | 0.81 | 0.59, 1.13 | 0.21 | 1.02 | 0.76, 1.37 | 0.90 | 0.98 | 0.79, 1.21 | 0.84 |
≥ 30.0 | 1.78 | 1.19, 2.66 | 0.01 | 1.49 | 1.09, 2.04 | 0.01 | 1.25 | 0.90, 1.72 | 0.18 | 0.76 | 0.58, 0.98 | 0.04 |
Models to assess mediation | ||||||||||||
M3: M2 + hypertensive disorders of pregnancyd | ||||||||||||
<18.5 | 0.63 | 0.14, 2.84 | 0.55 | 1.35 | 0.66, 2.76 | 0.41 | 1.31 | 0.74, 2.33 | 0.35 | 1.47 | 0.99, 2.17 | 0.06 |
18.5-24.9 (ref) | 1.00 | 1.00 | 1.00 | 1.00 | ||||||||
25.0-29.9 | 1.52 | 1.00, 2.33 | 0.05 | 0.73 | 0.52, 1.04 | 0.08 | 1.02 | 0.75, 1.37 | 0.91 | 0.97 | 0.78, 1.19 | 0.74 |
≥ 30.0 | 1.17 | 0.73, 1.87 | 0.53 | 1.12 | 0.79, 1.59 | 0.53 | 1.27 | 0.92, 1.75 | 0.15 | 0.76 | 0.58, 0.99 | 0.04 |
M4: M2 + chorioamnionitise | ||||||||||||
<18.5 | 0.42 | 0.10, 1.77 | 0.24 | 1.17 | 0.61, 2.26 | 0.63 | 1.48 | 0.81, 2.70 | 0.20 | 1.48 | 1.00, 2.19 | 0.05 |
18.5-24.9 (ref) | 1.00 | 1.00 | 1.00 | 1.00 | ||||||||
25.0-29.9 | 1.70 | 1.18, 2.45 | 0.01 | 0.81 | 0.59, 1.12 | 0.21 | 1.04 | 0.76, 1.42 | 0.82 | 0.98 | 0.79, 1.21 | 0.86 |
≥ 30.0 | 1.77 | 1.18, 2.64 | 0.01 | 1.49 | 1.09, 2.04 | 0.01 | 1.30 | 0.93, 1.83 | 0.13 | 0.76 | 0.58, 0.98 | 0.04 |
M5: M2 + gestational diabetesf | ||||||||||||
<18.5 | 0.44 | 0.10, 1.82 | 0.26 | 1.22 | 0.63, 2.33 | 0.56 | 1.32 | 0.74, 2.34 | 0.34 | 1.48 | 1.00, 2.19 | 0.05 |
18.5-24.9 (ref) | 1.00 | 1.00 | 1.00 | 1.00 | ||||||||
25.0-29.9 | 1.64 | 1.14, 2.36 | 0.01 | 0.75 | 0.54, 1.04 | 0.09 | 0.99 | 0.73, 1.33 | 0.93 | 0.95 | 0.77, 1.18 | 0.64 |
≥ 30.0 | 1.68 | 1.12, 2.52 | 0.01 | 1.25 | 0.90, 1.74 | 0.18 | 1.16 | 0.84, 1.61 | 0.37 | 0.73 | 0.56, 0.95 | 0.02 |
Grand model | ||||||||||||
M6: M2 + hypertensive disorders of pregnancyd + chorioamnionitise + gestational diabetesf | ||||||||||||
<18.5 | 0.63 | 0.14, 2.86 | 0.55 | 1.39 | 0.68, 2.82 | 0.36 | 1.52 | 0.83, 2.78 | 0.17 | 1.50 | 1.01, 2.22 | 0.04 |
18.5-24.9 (ref) | 1.00 | 1.00 | 1.00 | 1.00 | ||||||||
25.0-29.9 | 1.58 | 1.03, 2.42 | 0.04 | 0.69 | 0.49, 0.99 | 0.04 | 0.99 | 0.72, 1.37 | 0.98 | 0.94 | 0.76, 1.16 | 0.56 |
≥ 30.0 | 1.22 | 0.76, 1.98 | 0.41 | 1.01 | 0.70, 1.45 | 0.96 | 1.19 | 0.84, 1.69 | 0.33 | 0.73 | 0.56, 0.95 | 0.02 |