Table 1 Bivariate Predictors of 2-Hour Postpartum Hemorrhage (≥ 300 mL) in 1,903 Parturients

Age

Appropriate age

1335 (84.44%)

277 (86.02%)

1.051

0.591

Advanced age

240 (15.18%)

43 (13.36%)

Super-advanced age

6 (0.38%)

2 (0.62%)

BMI

Normal

8 (0.50%)

2 (0.62%)

2.700

0.259

Underweight

291 (18.41%)

47 (14.60%)

Overweight

1282 (81.09%)

273 (84.78%)

Previous cesarean

No

1528 (96.65%)

308 (95.65%)

0.515

0.473

Yes

53 (3.35%)

14 (4.35%)

Parity

1

881 (55.7%)

202 (62.7%)

5.077

0.024

 ≥ 2

700 (44.3%)

120 (37.3%)

Fetal position

LOA or ROA

1452 (91.84%)

288 (89.44%)

1.672

0.196

Others

129 (8.16%)

34 (10.56%)

Labor stage

First stage (min)

335.00 [210.00, 550.00]

390.00 [220.00, 561.25]

-2.614

0.009

Second stage (min)

4.00 [2.00, 17.00]

5.00 [2.00, 19.00]

-1.535

0.125

Third stage (min)

6.00 [4.00, 7.00]

5.00 [3.00, 7.00]

-2.298

0.022

Total stage (min)

351.00 [220.00, 560.00]

239.75 [402.00, 600.25]

-2.627

0.009

Newborn Apgar Score

1 min

9.00 [9.00, 9.00]

9.00 [9.00, 9.00]

-0.456

0.658

5 min

10.00 [10.00, 10.00]

10.00 [10.00, 10.00]

-0.035

0.972

10 min

10.00 [10.00, 10.00]

10.00 [10.00, 10.00]

-0.317

0.751

Oxytocin induction

NO

1105 (69.89%)

213 (66.15%)

1.589

0.207

Yes

476 (30.11%)

109 (33.85%)

Epidural analgesia

No

871 (55.09%)

148 (45.96%)

8.600

0.003

Yes

710 (44.91%)

174 (54.04%)

Polyhydramnios

No

1575 (99.62%)

322 (100.00%)

0.32

0.574

Yes

6 (16.92%)

0 (0.00%)

Macrosomia

No

1546 (97.79%)

306 (95.03%)

6.77

0.009

Yes

35 (2.21%)

16 (4.97%)

Placental adhesion

No

1512 (95.64%)

292 (90.68%)

12.32

 < 0.001

Yes

69 (4.36%)

30 (9.32%)

Birth canal injury

No

698 (44.15%)

183 (56.83%)

16.80

 < 0.001

Yes

883 (55.85%)

139 (43.17%)

Precipitate labor

No

1401 (99.62%)

297 (100.00%)

3.28

0.070

Yes

180 (16.92%)

25 (0.00%)