Distribution of observed and expected leukaemia cases below age 5 years, and Standardized Incidence Ratios (SIR) in different 5 km zones of distance from the 19 nuclear power plants in operation in France between 1990 and 1998.

Distance (radius)	Observed cases	Expected cases	SIR	95% Confidence Interval
0–5 km	5	5.2	0.96	[0.31–2.24]
5–10 km	20	15.4	1.30	[0.79–2.01]
10–15 km	18	18.3	0.99	[0.58–1.56]
15–20 km	71	69.3	1.03	[0.80–1.29]
Total	114	108.1	1.05	[0.87–1.27]

Overall, a total of 114 cases were observed within 20 km of a French NPP, against 108.1 cases expected. The results indicated no excess risk in any of the defined 5 km distance zones, or a decreasing trend of risk with increasing distance from the NPPs. In particular, the observed to expected case ratio for young children living within 5 km of a French NPP is 0.96 (95% confidence interval: 0.31 to 2.24).