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. 2017 Aug 17;12(8):e0183367. doi: 10.1371/journal.pone.0183367

Table 1. Demographic characteristics of sample.

United States Namibia Poland Argentina Total
(n = 20) (n = 6) (n = 23) (n = 21) (N = 70)
Infant Sex
    Male 7 2 12 9 30
    Female 13 4 11 12 40
Infant Age, days M(SD) 200 (101) 239 (194) 195 (100) 241 (107) 214 (112)
Maternal Parity Status
    Primiparous 10 0 11 3 24
    Multiparous 10 6 12 18 46
Parity M(SD) 1.7 (0.9) 5 (3.1) 2.1 (1.2) 3.9 (2.6) 2.8 (2.1)