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Table 1 Patient characteristics

From: The effect of advanced maternal age on perinatal outcomes in nulliparous singleton pregnancies

  Maternal Age Groups p
Maternal characteristics < 35 years (a) (n = 471) 35–39 years (b) (n = 399) ≥40 years (c) (n = 87) a vs. b a vs. c b vs. c
Age (year)a 27.6 ± 4.2 36.6 ± 1.4 41.71 ± 2.0 < 0.001 < 0.001 0.035
Gravidityb 1.0 (1.0–2.0) 1.0 (1.0–3.0) 1.0 (0.0–3.0) 0.865 0.759 0.980
Body Mass Index (kg/m2)a 28.7 ± 4.1 29.9 ± 5.8 30.1 ± 4.6 0.450 0.375 0.681
Consanguinity between spouses (first or second degree)c 26 (5.5) 19 (4.7) 3 (3.4) 0.284 0.120 0.330
Underwent invasive prenatal diagnosis procedurec 24 (5.1) 26 (6.5) 23 (26.4) 0.530 < 0.001 < 0.001
Educational statusc     0.101 0.085 0.253
Primary school 12 (2.5) 19 (4.7) 6 (6.9)    
High school 81 (17.2) 76 (19.1) 17 (19.5)    
Graduated or higher 378 (80.3) 304 (76.2) 77 (88.5)    
  1. aData are given as mean ± SD
  2. bData are given as median (minimum-maximum)
  3. cData are presented as n (%)
  4. Values with the same superscript letter within a row do not differ significantly at the 0.05 level