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Table 1 Comparison of demographic characteristics and perinatal factors between the training and the validation cohorts

From: Nomogram for perinatal prediction of intrapartum fever: a retrospective case–control study

Variable

Training cohort (n = 487)

Validation cohort (n = 209)

P

Age [M (IQR)]

28 (4)

29 (5)

0.081

BMI, kg/m2 [M (IQR)]

26.7 (3.9)

26.4 (4.7)

0.565

Gestational age, d [M (IQR)]

275 (11)

274 (10)

0.402

Accompany disease, n (%)

 GDM

62 (12.7%)

2 4(11.5%)

0.647

 Abnormal thyroid function

8 (1.6%)

3 (1.4%)

0.841

 Hypertension during pregnancy

20 (4.2%)

10 (4.8%)

0.729

Parity, n (%)

  

0.708

 Nulliparity

294 (60.4%)

123 (58.9%)

 

 Multiparous

193 (39.6%)

86 (41.1%)

 

Body temperature on admission, ℃ [M (IQR)]

36.5 (0.2)

36.5 (0.2)

0.232

WBC counts on admission, ×109 [M (IQR)]

8.3 (2.7)

8.7 (3.0)

0.168

HB on admission, g/L [M (IQR)]

12.1 (2)

12 (2)

0.508

Pre-labour ROM, n (%)

  

0.324

 Yes

72 (14.8%)

25 (12%)

 

 No

415 (85.2%)

184 (88%)

 

Duration from rupture of membranes to delivery, min [M (IQR)]

188 (434)

234 (480)

0.836

Method of membrane rupture, n (%)

  

0.407

 Spontaneous

224 (46.0%)

89 (42.6%)

 

 Surgical

263 (54%)

120 (57.4%)

 

Oxytocin usage, n (%)

  

0.325

 Yes

276 (56.7%)

110 (52.6%)

 

 No

211 (43.3%)

99 (47.4%)

 

Foetal weight, g [M (IQR)]

3340 (490)

3350 (580)

0.749

Amniotic fluid pollution III, n (%)

  

0.686

 Yes

20 (4.1%)

11 (5.3%)

 

 No

467 (95.9%)

198 (94.7%)

 

Duration of the first stage of labour, min [M (IQR)]

470 (450)

420 (438)

0.203

Duration of the second stage of labour, min [M (IQR)]

31 (46)

28 (48)

0.120

Number of vaginal examinations [M (IQR)]

2 (1)

2 (2)

0.803

Epidural labour analgesia, n (%)

  

0.933

 Yes

139 (28.5%)

59 (28.2%)

 

 No

348(71.5%)

150 (71.8%)

 

Analgesia time, min [M (IQR)]

0(160)

0 (133)

0.834

Apgar score at 5 minutes [M (IQR)]

9(10)

9 (10)

0.956

  1. Abbreviations: BMI body mass index, GDM gestational diabetes, HB haemoglobin, IQR interquartile range, M median, ROM rupture of membrane, WBC white blood cell