Table 3 Observed (O) and Expected (E) Frequency of Rupture of Aneurisms by Sex and Season of the Year in Patients Attended for Aneurismal SAH, Asenjo from January 1995 to December 1996.
From: Aneurismal subarachnoid hemorrhage in a Chilean population, with emphasis on risk factors
♂ | ♀ | ♀♂ | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
SEASON OF THE YEAR | № | % O | № E | χ2 | № | % OZ | № E | χ2 | № | % O | № E | χ2 |
AUTUMN | 11 | 19.30 | 14.25 | 0.74 | 44 | 28.95 | 38 | 0.95 | 55 | 26.3 | 52.25 | 0.14 |
WINTER | 9 | 15.79 | 14.25 | 1.93 | 29 | 19.08 | 38 | 2.13 | 38 | 18.2 | 52.25 | 3.86 |
SPRING | 23 | 40.35 | 14.25 | 5.37 | 51 | 33.55 | 38 | 4.45 | 74 | 35.4 | 52.25 | 9.05 |
SUMMER | 14 | 24.56 | 14.25 | 0.00 | 28 | 18.42 | 38 | 2.63 | 42 | 20.1 | 52.25 | 2.01 |
TOTAL | 57 | 100 | 57 | 8.05 | 152 | 100 | 152 | 10.16 | 209 | 100 | 209 | 15.06 |
p value | 0.045 | 0.017 | 0.0017 | |||||||||