Subarachnoid Haemorrhage Incidence Pattern Analysis with Circular Statistics

Table 1

Cycle lengths that had both statistically significant Raleigh and Kuiper tests.

Cycle length	95% CI lower limit	95% CI upper limit	Rayleigh	Kuiper	Known cycles could fall within the 95% confidence interval
4	3.47	4.53	0.035	0
7	6.09	7.91	0.03	0	Weekly cycle
31	26.33	35.67	0.05	0.004	Lunar cycle
53	45.3	60.7	0.044	0.008
83	70.9	95.1	0.05	0.039	Period between equinoxes and/or solstices
86	74.93	97.07	0.026	0.006	Period between equinoxes and/or solstices
165	102.51	227.49	0.018	0.039	Period between equinoxes and/or solstices
167	147.08	186.92	0.018	0.006	Period between equinoxes and/or solstices
225	192.94	257.06	0.038	0.014
226	196.02	255.98	0.027	0.013
227	141.75	312.25	0.02	0.044	Period between equinoxes and/or solstices
230	143.94	316.06	0.022	0.043	Period between equinoxes and/or solstices