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Table 1 Characteristics women in the VeCaS cohort compared to national cohort (2015)

From: Detailed registration of care in midwifery practices in the Netherlands: an opportunity for research within a healthy pregnant population

 VeCaS cohortNational cohort 
N = 4640100%N = 127,818100%
Maternal age
 All women (mean, SD)30.4(SD 4.5)30.4(SD 4.6)p = 1.00
 Primiparous women (mean, SD)28.8(SD 4.3)28.9(SD 4.6)p = 0.3174
Age in categories
 All women
   < 20 yr270.6%11250.9% 
  20–24 yr3738.0%12,0729.4% 
  25–29 yr157533.9%41,13832.2% 
  30–34 yr180238.8%49,43838.7% 
  35–39 yr74816.1%20,88516.3% 
   ≥ 40 yr1152.5%31602.5% 
Parity
 P0218447.1%58,60845.9%χ2 = 16.757, df = 2, p = 0.0002
 P1172337.1%46,01036.0% 
 P2+73315.8%23,19818.1% 
 missing0 2  
Background
 Dutch371384.1%96,58975.6%χ2 = 171.058, df = 1, p < 0.0001
 Non-Dutch70015.7%31,22924.4% 
 missing227    
Social Economic Status (SES)a
 Higher4559.9%30,14923.7%χ2 = 499.183, df = 2, p < 0.0001
 Middle253855.2%55,94944.0% 
 Lower160634.9%41,14632.3% 
 missing41 574  
Urbanizationb
 Very high (> 2500)2264.9%31,69324.8%χ2 = 1463.241, df = 4, p < 0.0001
 High (1500–2500)89419.4%32,70725.6% 
 Middle (1000–1500)149832.4%23,98918.8% 
 Low (500–1000)108023.4%21,99117.2% 
 very low (100–500)91919.9%17,23213.5% 
 missing23 206  
BMI in kg/m2
 Low (< 18,5)1493.2%   
 Normal (18,5-24,9)277761.1%   
 Overweight (25–29,9)108823.9%   
 Obesitas (≥30)53011.7%   
 missing96    
Smoking in pregnancy
 No367681.0%   
 Stopped in 1st trimester3678.1%   
 Yes49710.9%   
 missing100    
  1. abased on 4 digits of the postal code
  2. bbased on 4 digits of the postal code, number of households/km2