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Table 1 Subject characteristics (mothers, n = 630; the youngest children, n = 916)

From: A low-birth-weight risk assessment scale: development and validation through a questionnaire-based survey

Items n (%) Mean (SD) Range
Maternal age (years; n = 629*)   35.7 (4.9) 23–51
Number of children in the family   2.2 (0.9) 1–8
Child age (years; n = 914*)   3.6 (1.8) 0–6
Child sex (n = 869*)
 Boys 463 (53.3)   
 Girls 406 (46.7)   
Child weight at birth (g) 3005.7 (423.5) 722–4320
< 2500 89 (9.7) 2201.7 (333.8) 722–2498
≥2500 827 (90.3) 3092.2 (331.1) 2500–4320
Gestational age at birth (weeks; n = 884) 38.7 (1.7)   25–42
Maternal age at birth (years; n = 909) 31.2 (4.6)   20–50
Birth history
 Primipara 347 (37.9)   
 Multipara 569 (62.1)   
Maternal weight gain during pregnancy (kg; n = 895) 10.1 (3.7)   −4.0–27.0
Maternal employment status during pregnancy
 Non-working 397 (43.3)   
 Working 519 (56.7)   
  1. *Excluded undescribed data