Table 1.

Magnitude of the seasonal component of stroke mortality and respiratory disease mortality times series in the United States for 1938 through 1988

ConditionPeriodMagnitude mean (SEM)p Value
* Comparison of the 1953 through 1966 and the 1938 through 1952 time periods.
† Comparison of the 1967 through 1988 and the 1953 through 1966 time periods.
Stroke1938–195210.78 (0.56)
1953–19669.47 (0.71)0.0002*
1967–19888.12 (0.74)<0.0001
Respiratory disease1938–195228.92 (0.69)
1953–196611.18 (0.25)<0.0001*
1967–19888.84 (0.20)0.019