Blood lead levels of contemporary Japanese children

Table 2 Comparison of blood Pb concentration (μg/dL) of children by age group and region

Age range (years)	Tokyo		Osaka		Shizuoka		Total		ANOVA
Age range (years)	n	GM (GSD)*	n	GM (GSD)	n	GM (GSD)	n	GM (GSD)	ANOVA
1–3	40	1.09 (1.42)^aα	17	1.34 (1.42)^a	34	1.34 (1.59)^b	91	1.22 (1.50)^α	p < 0.05
4–6	36	0.923 (1.40)^aα	8	1.30 (1.34)^a	47	1.15 (1.60)^b	91	1.06 (1.53)^α	p < 0.05
7–10	22	0.847 (1.30)^aβ	6	1.11 (1.41)^a	53	1.12 (1.54)^b	81	1.04 (1.50)^α	p < 0.05
>11	31	0.833 (1.42)^aβ	3	0.889 (1.45)^a	51	1.07 (1.50)^b	85	0.970 (1.49)^β	p < 0.05
ANOVA^#		p < 0.001		NS		NS		p < 0.01

Significant difference is present between GMs with different alphabet (regional difference) and Greek letters (age grade) (Scheffé’s multiple-comparison procedure)
The total number of subjects was 348 in this table because there were 4 children without age information in the 352 children
NS not significant
* Geometric mean and geometric standard deviation in parenthesis
^# Analysis of variance

ISSN: 1347-4715