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Table 1 Background characteristics and pregnancy outcomes in primiparous women aged 25–31 years (reference group), 32–37 years (advanced age), and ≥38 years (very advanced age), and comparison of women aged ≥25 who gave birth in 2003 in the study and in Norway in total

From: Satisfaction with life during pregnancy and early motherhood in first-time mothers of advanced age: a population-based longitudinal study

  Study group (n=18 565) Women ≥25 years giving birth in 2003
  Age 25-31 (n=13107) % Age 32-37 (n=4827) % Age ≥38 (n=631) % Sub-sample of the study (n=2429) % Norwegian sample (n=16760) % P-value
Sociodemographic background       
Maternal age (years)*       0.005
 25-29     55.7 54  
 30-34     34.5 35.1  
 35-39     9 9.6  
 ≥40     0.8 1.2  
Single status 2.1 3.9 10 2.8 5.7 <0.001
Native language other than Norwegian 4.9 7.5 5.7    
Unemployed 1.8 1.8 2.5    
Income (NKR)**       
 <200 000 11.1 5.8 6.5    
 200 000-399 999 58 46.2 45.8    
 ≥400 000 26 42.8 40.3    
Pregravid BMI, (kg/m2)       
 Underweight <18.5 2.8 1.9 2.1    
 Normal weight 18.5-24.9 68.2 65.4 59.6    
 Overweight 25-29.9 18.9 21 22.7    
 Obesity ≥30 7.7 8.6 11.6    
Smoking* 8 7.1 8.2 8 13.9 <0.001
Obstetric and infant outcomes       
IVF present pregnancy* 2.5 7.9 12.8 3.6 4.9 <0.001
Mode of delivery       
 Vacum extraction 14.4 15.7 15.7 14.3 13.7 0.36
 Forceps 2.8 3.3 3.8 2.5 22.4 0.32
 Elective caesarean delivery 3.1 5.8 11.1 4.2 5.3 <0.001
 Emergency caesarean delivery 9.4 12.9 19 11.2 12.5 0.03
 Unspecified caesarean delivery 1.8 2.3 4 1.2 2.5 <0.001
 Unassisted vaginal delivery 69 60.6 47.4 67.1 63.6  
Infant outcomes       
Preterm*** 5.8 6.5 8.9 6.5 8.8 <0.001
Neonatal transfer 9.2 10.5 13.6 10.3 12.5 <0.001
  1. *Data from the Norwegian Medical Birth Register.
  2. **NKR: NOK/GBP = 10.90.
  3. ***Preterm: 22–36 weeks of pregnancy.