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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