Table 1.

ALS: Crude and age- and sex-adjusted mean annual incidence rates/100,000 and standardized incidence ratios (SIR) according to provinces of residence

ProvincePerson-years at risk*No. casesCrude incidence rate/10695% CIAdjusted incidence rate/10695% CISIR
* Population estimates for 1995 and 1996.
† Adjusted on the 1991 Italian census population.
‡ Using overall population as reference.
Alessandria867,827202.301.41 –3.541.851.13 –2.850.80
Aosta237,19883.371.49 –6.802.811.21 –5.541.34
Asti419,932143.331.82 –5.592.671.46 –4.491.14
Biella381,188102.621.26 –4.822.101.01 –3.860.98
Cuneo1,104,378292.631.46 –3.342.401.61 –3.460.98
Novara679,919202.941.80 –4.532.731.80 –4.201.20
Torino4,442,9891042.341.92 –2.852.341.92 –2.850.98
Verbania322,57782.481.07 –4.882.331.00 –4.591.15
Vercelli364,18382.200.95 –4.331.860.80 –3.660.89
Total8,818,8692112.502.21 –2.882.251.98 –2.491