| UN (mmol/L) in the second trimester | Ptrend | Per–SD increase | |||
---|---|---|---|---|---|---|
Q1 (< 2.23) | Q2 (2.23–2.50) | Q3 (2.55–3.00) | Q4 (> 3.00) | |||
PROM | ||||||
 Case/N | 88/458 | 76/352 | 80/442 | 69/350 |  |  |
 Model 1 | 1 (ref) | 1.16 (0.82, 1.63) | 0.93 (0.66, 1.30) | 1.03 (0.73, 1.47) | 0.838 | 0.97 (0.86, 1.10) |
 Model 2 | 1 (ref) | 1.15(0.82, 1.63) | 0.95(0.68, 1.34) | 1.05(0.73, 1.50) | 0.938 | 0.98(0.86, 1.11) |
PTB | ||||||
 Case/N | 9/458 | 7/352 | 12/442 | 9/350 |  |  |
 Model 1 | 1 (ref) | 1.01 (0.37, 2.75) | 1.39 (0.58, 3.34) | 1.32 (0.52, 3.35) | 0.440 | 1.02 (0.73, 1.40) |
 Model 2 | 1 (ref) | 0.98 (0.35, 2.71) | 1.36 (0.56, 3.32) | 1.26 (0.48, 3.28) | 0.500 | 0.98 (0.71, 1.37) |
LBW | ||||||
 Case/N | 8/458 | 4/352 | 8/442 | 9/350 |  |  |
 Model 1 | 1 (ref) | 0.65 (0.19, 2.17) | 1.04 (0.39, 2.79) | 1.49 (0.58, 3.89) | 0.349 | 1.10 (0.77, 1.56) |
 Model 2 | 1 (ref) | 0.75(0.22, 2.58) | 1.03(0.38, 2.85) | 1.58(0.58, 4.29) | 0.346 | 1.12(0.78, 1.61) |
SGA | ||||||
 Case/N | 18/458 | 12/352 | 27/442 | 26/350 |  |  |
 Model 1 | 1 (ref) | 0.86 (0.41, 1.82) | 1.59 (0.86, 2.93) | 1.96 (1.06, 3.64) | 0.011 | 1.18 (0.96, 1.46) |
 Model 2 | 1 (ref) | 0.90(0.43, 1.92) | 1.54(0.83, 2.87) | 2.18 (1.16, 4.13) | 0.007 | 1.21(0.98, 1.50) |
 | UN (mmol/L) in the third trimester |  |  | |||
---|---|---|---|---|---|---|
Q1 (< 2.45) | Q2 (2.45–2.90) | Q3 (2.93–3.35) | Q4 (> 3.35) | |||
PROM | ||||||
 Case/N | 87/408 | 85/455 | 55/339 | 86/400 |  |  |
 Model 1 | 1 (ref) | 0.85 (0.61, 1.18) | 0.72 (0.49, 1.04) | 1.01 (0.72, 1.41) | 0.874 | 1.01 (0.89, 1.14) |
 Model 2 | 1 (ref) | 0.83 (0.59, 1.16) | 0.65 (0.44, 0.96) | 0.91 (0.65, 1.29) | 0.443 | 0.97 (0.85, 1.10) |
PTB | ||||||
 Case/N | 14/408 | 8/455 | 6/339 | 9/400 |  |  |
 Model 1 | 1 (ref) | 0.50 (0.21, 1.21) | 0.51 (0.19, 1.33) | 0.65 (0.28, 1.51) | 0.309 | 0.74 (0.52, 1.06) |
 Model 2 | 1 (ref) | 0.50 (0.21, 1.22) | 0.49 (0.18, 1.33) | 0.68 (0.28, 1.60) | 0.354 | 0.75 (0.52, 1.08) |
LBW | ||||||
 Case/N | 8/408 | 8/455 | 4/339 | 9/400 |  |  |
 Model 1 | 1 (ref) | 0.89 (0.33, 2.41) | 0.60 (0.18, 2.00) | 1.15 (0.44, 3.01) | 0.898 | 1.01 (0.69, 1.45) |
 Model 2 | 1 (ref) | 0.82 (0.30, 2.27) | 0.54 (0.15, 1.87) | 1.06 (0.39, 2.86) | 0.996 | 0.99 (0.68, 1.44) |
SGA | ||||||
 Case/N | 15/408 | 16/455 | 20/339 | 32/400 |  |  |
 Model 1 | 1 (ref) | 0.96 (0.47, 1.96) | 1.64 (0.83, 3.26) | 2.28 (1.21, 4.28) | 0.002 | 1.38 (1.13, 1.68) |
 Model 2 | 1 (ref) | 0.86 (0.42, 1.79) | 1.57 (0.78, 3.16) | 2.29 (1.20, 4.36) | 0.002 | 1.35 (1.11,1.64) |