Table 1. Distribution (or Means) of Sample Characteristics by AFB (N=905)a
CharacteristicsAFB, yNulliparous Women (N=100)
<20 (N=188)20–24 (N=355)25–29 (N=169)≥30 (N=93)
Study site, N (%)
Kingston (Ontario, Canada)23 (12.2)48 (13.5)49 (29.0)27 (29.0)25 (25.0)
Saint‐Hyacinthe (Quebec, Canada)11 (5.9)71 (20.0)54 (32.0)18 (19.4)28 (28.0)
Tirana (Albania)26 (13.8)106 (29.9)32 (18.9)11 (11.8)13 (13.0)
Manizales (Colombia)75 (39.9)71 (20.0)18 (10.7)17 (18.3)17 (17.0)
Natal (Brazil)53 (28.2)59 (16.6)16 (9.5)20 (21.5)17 (17.0)
Age, mean (SD), y69.2 (2.9)69.1 (2.9)69.3 (2.8)68.9 (2.7)68.8 (2.7)
Childhood economic adversity, N (%)b
No92 (48.9)192 (54.1)109 (64.9)51 (54.8)61 (61.0)
Yes96 (51.1)163 (45.9)59 (35.1)42 (45.2)39 (39.0)
Childhood social adversity, N (%)b
No126 (67.0)267 (75.2)128 (76.2)70 (75.3)81 (81.0)
Yes62 (33.0)88 (24.8)40 (23.8)23 (24.7)19 (19.0)
Education site specific, N (%)c
Low114 (60.6)144 (40.6)53 (31.4)27 (29.0)34 (34.0)
Medium54 (28.7)129 (36.3)56 (33.1)28 (30.1)31 (31.0)
High20 (10.6)82 (23.1)60 (35.5)38 (40.9)35 (35.0)
Income, N (%)d
Poor81 (43.6)115 (32.7)57 (34.3)28 (31.1)30 (30.3)
Middle85 (45.7)168 (47.7)73 (44.0)41 (45.6)44 (44.4)
High20 (10.8)69 (19.6)36 (21.7)21 (23.3)25 (25.3)
Parity, N (%)e
Nulliparous0 (0.0)0 (0.0)0 (0.0)0 (0.0)100 (100.0)
1–346 (24.5)221 (62.4)146 (86.9)88 (94.6)0 (0.0)
≥4142 (75.5)133 (37.6)22 (13.1)5 (5.4)0 (0.0)
  • AFB indicates age at first childbirth.

  • a AFB is missing for 3 participants.

  • b One missing value.

  • c Site specific, for women only (no laboratory included).

  • d Twelve missing values.

  • e Two missing values.