Table 1

Comparison of the SRB of Chinese babies born in China with the SRB of Chinese and of non-Chinese babies born in Tuscany, 2000. Comparison between the SRBs of Chinese and non-Chinese babies born in Tuscany, Italy, 1992–2002

	A			B				C
	Chinese babies born in Tuscany			Non-Chinese babies born in Tuscany			(A–B)	Chinese babies born in China*			(A–C)
Period†	Live births	SRB	SRB 95%CI	Live births	SRB	SRB 95%CI	χ²p value	Live births	SRB	SRB 95% CI	χ²p value
* Sources: China Population Statistics Yearbook 2001, China Statistics Press, National Bureau of Statistics of the People’s Republic of China, 2001 and US Census Bureau data, available at http://www.census.gov. † Periods are calculated from 1 July of one year to 30 June of another, except for the year 2000.
2000	644	0.969	0.830 to 1.131	28247	1.058	1.033 to 1.082	NS	17721620	1.168	1.166 to 1.169	0.017
1992–93	159	1.120	0.821 to 1.527	24149	1.098	1.070 to 1.126	NS
1993–94	180	0.978	0.731 to 1.308	24l788	1.059	1.033 to 1.085
1994–95	198	1.020	0.773 to 1.340	24334	1.066	1.039 to1.093
1995–96	238	1.016	0.789 to 1.310	25076	1.068	1.042 to 1.095
1996–97	368	1.127	0.919 to 1.382	25826	1.049	1.024 to 1.075
1997–98	390	0.959	0.787 to 1.170	25695	1.071	1.056 to 1.109
1998–99	490	0.983	0.824 to 1.173	26502	1.066	1.041 to 1.092
1999–00	560	1.066	0.903 to 1.258	27699	1.075	1.050 to 1.101
2000–01	693	0.957	0.825 to 1.111	28677	1.056	1.032 to 1.081
2001–02	869	1.109	0.971 to1.267	28 611	1.047	1.023 to 1.072
1st half 1992–97	1143	1.059	0.943 to1.189	124173	1.067	1.055 to 1.078	NS
2nd half 1997–02	3002	1.024	0.953 to 1.100	137184	1.063	1.052 to 1.074	NS
Overall 1992–02	4145	1.033	0.972 to 1.098	261357	1.065	1.057 to 1.073	NS