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Table 2 Comparison of the study population characteristics according to exposure to ART (all methods combined)

From: Assessing the role of multiple pregnancies in the association between tetralogy of Fallot and assisted reproductive techniques: a path-analysis approach

Variable Exposure to ART p
No Yes
n %§ n %§
Mother Age (years)      
Mean (SD) 30.4 (5.2) 33.0 (4.6) <0.001
Median (p25–p75) 30 (27 – 34) 33 (30 – 37)  
<20 61 1.4 0 0.0 <0.001
20 – 29 1,874 43.4 39 22.8
30 – 34 1,440 33.4 68 39.8
35 – 39 727 16.9 52 30.4
≥ 40 213 4.9 12 7.0
Geographic origin      
France 2,416 56.4 124 72.9 <0.001
North Africa 484 11.3 11 6.5
Subsaharan Africa 573 13.4 9 5.3
Other 808 18.9 26 15.3
Occupation      
None 1,134 27.1 24 14.2 <0.001
Professional 988 23.6 60 35.5
Intermediate 851 20.3 43 25.4
Administrative/public service 867 20.7 28 16.6
Other 346 8.3 14 8.3
Father Age (years)      
Mean (SD) 33.9 (6.6) 35.0 (5.8) 0.044
Median (p25–p75) 33 (29 – 38) 34 (31 – 38)
<20 6 0.2 0 0.0 <0.001
20 – 29 924 26.1 17 10.8
30 – 34 1,206 34.0 66 42.0
35 – 39 756 21.3 47 29.9
≥ 40 652 27.0 27 17.2
Geographic origin      
France 2,327 57.1 118 71.5 0.002
North Africa 463 11.4 11 6.7
Subsaharan Africa 550 13.5 11 6.7
Other 736 18.1 25 15.2
Occupation      
None 291 7.5 6 3.7 0.023
Professional 1,454 37.7 80 49.1
Intermediate 573 14.9 25 15.3
Administrative/public service 480 12.4 14 8.6
Other 1,060 27.5 38 23.3
Pregnancy Outcome      
Still-births 22 0.5 3 1.8 0.099
Live-births 4,183 96.3 163 95.3
Pregnancy terminations 123 2.8 5 2.9
  Multiplicity      
Singletons 2,908 97.0 94 71.8 <0.001
Twins 88 2.9 31 23.7
  Triplets 3 0.1 6 4.6  
  1. §% calculated with the total of cases or controls without missing data as a denominator.