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Table 1 Demographic characteristics of cases and controls in the IPD analysis

From: A better understanding of the association between maternal perception of foetal movements and late stillbirth—findings from an individual participant data meta-analysis

Variable N = 851 Cases, n or mean % or s.d. N = 2257 Controls, n or mean % or s.d. Chi-square or t-test (p-value)
Maternal age        12.24 (0.06)
 < 20 846 33 3.9 2238 59 2.6  
 20–24   115 13.6   274 12.2  
 25–29   228 27.0   631 28.2  
 30–34   265 31.3   794 35.5  
 35–39   160 18.9   396 17.7  
 40+   45 5.3   84 3.8  
Maternal BMI 842 27.7 6.9 2229 26.3 6.1 4.99 (< 0.0001)
Maternal ethnicity        21.43 (0.0015)
 White 851 522 61.3 2257 1545 68.5  
 Black   22 2.6   42 1.9  
 South Asian   90 10.6   219 9.7  
 South East and East Asian   40 4.7   111 4.9  
 Maori   46 5.4   107 4.7  
 Pacific   91 10.7   154 6.8  
 Others   40 4.7   79 3.5  
Parity        56.49 (< 0.0001)
 Nulliparous 851 446 52.4 2257 930 41.2  
 1–2   292 34.3   1110 49.2  
 3–4   87 10.2   176 7.8  
 5+   26 3.1   41 1.8  
Maternal education        39.59 (< 0.0001)
 Primary 842 187 22.2 2249 348 15.5  
 Secondary   161 19.1   343 15.3  
 University   328 39.0   1069 47.5  
 Post-graduate degree   73 8.7   240 10.7  
 Non-university trading education   93 11.0   249 11.1  
Marital status        22.60 (< 0.0001)
 Not in stable relationship 847 92 10.9 2255 143 6.3  
 Stable relationship   755 89.1   2112 93.7  
Smoking status        39.19 (< 0.0001)
 Current smoker 848 145 17.1 2247 205 9.1  
 Non-smoker or quit smoking before end of 1st trimester   703 82.9   2042 90.9  
Gestational age (weeks) 851 36.7 3.6 2257 36.3 3.7 2.64 (0.008)
 28–32   151 17.7   479 21.2 5.78 (0.06)
 33–36   214 25.2   523 23.2  
 37+   486 57.1   1255 55.6