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Table 4 Characteristics of included population, excluded population, and total population in Taiwan 2001–2003.

From: Water disinfection by-products and the risk of specific birth defects: a population-based cross-sectional study in Taiwan

Characteristics Included population Excluded population Total population
  N % N % N %
Total 396,049 100 325,240 100 721,289 100
Gender of infant       
   Male 206,723 52.2 170,385 52.4 377,108 52.3
   Female 189,326 47.8 154,524 47.6 343,850 47.7
Maternal age       
   <20 years 15,217 3.8 16,223 5.0 31,440 4.4
   20–34 341,307 86.2 282,381 86.8 623,688 86.5
   35- 39,519 10.0 26,631 8.2 66,150 9.2
Maternal diabetes mellitus       
   Yes 930 0.2 876 0.3 1,806 0.3
   No 395,119 99.8 324,364 99.7 719,483 99.7
Plurality       
   Singleton 385,371 97.3 316,903 97.4 702,274 97.4
   Multiple birth 10,678 2.7 8,337 2.6 19,015 2.6
Population density (no of people/km2)*       
   <1000 83,357 21.1 94,304 29.5 177,661 24.8
   1000–5000 153,654 38.8 144,069 45.0 297,723 41.6
   >5000 158,674 40.1 81,817 25.6 240,491 33.6