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Table 2 Selected characteristics of pregnant women according to hypothyroxinemia condition

From: Para-occupational exposure to pesticides, PON1 polymorphisms and hypothyroxinemia during the first half of pregnancy in women living in a Mexican floricultural area

Characteristics All women Hypothyroxinemia p valuea
N = 381 Yes n = 207 No n = 174
Maternal Age (years)
 Mean ± SD 24.20 ± 5.7 24.83 ± 5.98 23.45 ± 5.26 0.02
Marital status n(%)
 Unitedb 338 (88.71) 188 (90.82) 150 (86.21) 0.16
 No united 43 (11.29) 19 (9.18) 24 (13.79)  
Education n(%)
 Elementary school 76 (19.95) 53 (25.60) 23 (13.22) < 0.01
 Middle school 189 (49.61) 105 (50.72) 84 (48.28)  
  > Middle school 116 (30.45) 49 (23.67) 67 (38.51)  
Gestational age (weeks)
 Mean ± SD 10.20 (2.80) 10.36 ± 2.83 9.99 ± 2.74 0.20
Body Mass Indexc
 Mean ± SD 24.50 (4.40) 24.85 ± 4.46 24.07 ± 4.30 0.08
Coffee intake n(%)
 Yes 293 (76.90) 153 (73.91) 140 (80.86) 0.13
 No 88 (23.10) 54 (26.09) 34 (19.54  
Parity n(%)
 Primiparous 157 (41.21) 79 (38.16) 78 (44.83) 0.19
 Multiparous 224 (58.79) 128 (61.84) 96 (55.17)  
Smoking n(%)
 Yes 123 (32.28) 57 (27.54) 66 (37.93) 0.03
 No 258 (67.72) 150 (72.46) 108 (62.07)  
Alcohol intake n(%)
 Yes 253 (66.40) 137 (66.18) 116 (66.67) 0.92
 No 128 (33.60) 70 (33.82) 58 (33.33)  
Iodine supplementationd n(%)
 Yes 43 (11.91) 24 (12.18) 19 (11.59) 0.86
 No 318 (88.09) 173 (87.82) 145 (88.41)  
Sampling season n(%)
 Summer 181 (47.51) 108 (52.17) 73 (41.95) 0.05
 Winter 200 (52.49) 99 (47.83) 101 (58.05)  
  1. aχ2 or Student t-test, except for BMI, where Mann Whitney test was used
  2. bUnited includes married and women in free union
  3. cAt time of interview
  4. dFrom 3 months before pregnancy until time of interview