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Table 1 Demographics for study population and comparison of those excluded due to missing data

From: Neurodevelopmental outcomes among 2- to 3-year-old children in Bangladesh with elevated blood lead and exposure to arsenic and manganese in drinking water

  Full study N = 812 Current analysis n = 525 Excluded n = 287  
  n % n % n % p-value
Clinica        0.0002
 Sirajdikhan 409 50.4 239 45.5 170 59.2  
 Pabna 403 49.6 286 54.5 117 40.8  
Maternal characteristics        
Age at enrollment, median(range)b 22 (18–41) 22 (18–39) 22 (18–41) 0.69
Educationa        0.06
 Primary or less 380 46.8 233 44.4 147 51.2  
 Secondary or greater 432 53.2 292 55.6 140 48.8  
Type of deliverya        0.10
 Vaginal 517 63.7 347 66.1 170 59.2  
 Cesarean 278 34.2 166 31.6 112 39.0  
 Vaginal forceps assisted 17 2.1 12 2.3 5 1.8  
Exposed to second-hand smokea        0.05
 Yes 346 42.6 211 40.2 135 47.1  
 No 465 57.3 314 59.8 151 52.6  
 Missing 1 0.1 0 0.0 1 0.3  
Raven score, median (range)b 24 (0–54) 25 (3–54) 22 (0–46) <0.0001
 Missing 14 0 14  
Home score, median (range)b 43 (30–48) 43 (30–48) 44 (34–47) 0.01
 Missing 2 0 2  
Child characteristics        
Child’s age at time of assessment in years, median (range)b 2.3 (1.7–3.4) 2.3 (1.7–3.3) 2.4 (1.9–3.4) 0.72
Sexa        0.43
 Male 412 50.7 261 49.7 151 52.6  
 Female 400 49.3 264 50.3 136 47.4  
Birth Ordera        0.20
 1 344 42.4 213 40.6 131 45.7  
 2 282 34.7 189 36.0 93 32.4  
 3 129 15.9 81 15.4 48 16.7  
 4+ 56 6.9 42 8.0 14 4.9  
 Missing 1 0.1 0 0.0 1 0.3  
Preterm birth, <37 weeksa        0.28
 Yes 176 21.7 120 22.9 56 19.5  
 No 633 78.0 404 77.0 229 79.8  
 Missing 3 0.4 1 0.2 2 0.7  
Picaa        0.75
 Yes 314 38.7 205 39.0 109 38.0  
 No 497 61.2 319 60.8 178 62.0  
 Missing 1 0.1 1 0.2 0 0.0  
Gestational age in weeks, median (range)b 38.0 (28–42) 38.0 (28–42) 39.0 (29–42) 0.0003
 Missing 3 1 2  
Birth Weight in kg, median (range)b 2.9 (0.8–4.8) 2.9 (0.8–4.5) 2.8 (1.0–4.8) 0.17
Current length in cm, median (range)b 83.0 (48–96) 82.0 (48–96) 83.0 (68–94) 0.46
 Missing 1    1  
Current weight in kg, median (range)b 11.0 (6.1–20.0) 11.0 (6.1–20.0) 11.0 (7.3–17.8) 0.51
 Missing 2    2  
Current head circumference in cm, median (range)b 45.0 (40–51) 45.0 (40–51) 45.0 (40–50) 0.16
 Missing 1    1  
Current hematocrit, %, median (range)b 35 (18–58) 35 (18–56) 35 (22–58) 0.63
 Missing 78 0 78  
  1. aChi-square test
  2. bWilcoxon rank sum test