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. 2014 Aug 15;14:276. doi: 10.1186/1471-2393-14-276

Table 1.

Background characteristics and delivery details

Direct blood loss measurement Indirect blood loss measurement p-value a
(n = 450) (n = 450)
Maternal age in years: median (range) 25 (17–37) 24 (18–39) 0.58
Parity: median (range) 1 (0–4) 1 (0–4) 0.96
Gravidity: median (range) 2 (1–7) 2 (1–6) 0.69
Gestational age in weeks: median (range) 39 (28–43) 39 (28–43) 0.62
Nulliparous: % (n) 47.3 (213) 48.9 (220) 0.69
Pre-delivery hemoglobin: median (range) 11.2 (6.1–15.3)b 11.3 (5.5–16.3)c 0.27
Type of delivery: % (n) 0.90
Vaginal 91.8 (413) 92.2 (415)
Forceps 8.2 (37) 7.8 (35)
Delivery outcome: % (n) > 0.99
Singleton (live birth) 99.3 (447) 99.1 (446)
Twins (live birth) 0.2 (1) 0.4 (2)
Triplets (live birth) 0.2 (1) 0.0 (0)
Singleton (stillborn) 0.2 (1) 0.2 (1)
Twins (stillborn) 0.0 (0) 0.2 (1)
One or more complications (including vaginal or perineal tears): % (n) 1.1 (5) 2.4 (11) 0.21

aCalculated with the Wilcoxon rank-sum test and Fisher’s exact test.

bn = 422.

cn = 416.