Table 4.

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

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