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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