Subarachnoid Haemorrhage Incidence Pattern Analysis with Circular Statistics

Table 5

Distribution of SAH incidences in equal periods before and after each of the solstices.

	Freq.	Percent	Cum.
1	82	18.1	18.1
2	77	17	35.1
3	77	17	52.1
4	69	15.23	67.33
5	73	16.11	83.44
6	75	16.56	100
Total	453	100

The length of periods was arbitrarily selected as 1/6th of the times between the solstices (Pearson chi2 (5) = 1.2649, Pr = 0.939).