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. 2020 Jun 16;15(6):e0231882. doi: 10.1371/journal.pone.0231882

Table 1. Sociodemographic characteristics of adolescent, control, and advanced maternal age nursing mothers included in the study.

Characteristics Adolescents (n = 117) Controls (n = 158) AMA (n = 39) p
Maternal characteristics
Age (years)# 20 (12–23)a0 29 (24–35)b0 37 (36–46)c0 <0.0001*
Ethnicity ɣ
White 50 (42.7) 76 (48.1) 12 (30.8) 0.14
Non White 67 (57.3) 82 (51.9) 27 (69.2)
Marital status ɣ
Single 41 (35.0) 17 (10.7) 6 (15.4) <0.0001*
Stable union 76 (65.0) 141 (89.3) 33 (84.6)
Profession ɣ
Paid 22 (18.8) 62 (39.3) 21 (53.8) 0.0002*
Unpaid 95 (81.2) 96 (60.7) 18 (46.2)
Smoking habit ɣ
Yes 6 (5.1) 16 (10.1) 7 (17.9) 0.13
Ex-smoker 18 (15.4) 17 (10.7) 4 (10.2)
Mother living with smokers ɣ
Yes 45 (38.4) 48 (30.4) 14 (35.9) 0.36
Consumed Alcohol ɣ
Yes 3 (2.6) 1 (0.6) 1 (2.6) 0.49
Physical activity practice ɣ
Yes 11 (9.4) 8 (5.1) 2 (5.1) 0.64

# Kruskal-Wallis test, followed by Dunn test for comparison between groups: median (minimum—maximum);

ɣ X2 Test or Fisher's exact test, n (%);

* statistically significant (p<0.05); In lines, values followed by the same letters and the same index do not statistically differ.