Table 3

 Incidence of ALS in men and women 45 to 74 years old by latitude gradient in selected studies in Europe which used a prospective cohort design, age adjusted to the 1990 US population

CountryYearsLatitude (°)IR menIR womenCombined IR95% CI IR
CI, confidence interval; IR, incidence rate.
Scotland198955 to 596.73.85.24.1 to 6.4
Ireland1995 to 199752 to 556.75.36.05.1 to 6.9
Piemonte (Italy)1995 to 199644 to 465.94.75.44.6 to 6.3
Puglia (Italy)1998 to 199940 to 425.52.94.12.6 to 5.7