Table 1

Hawaiian live births and necropsy confirmed SIDS, by calendar month, 1979–2002, with predicted deaths computed by assuming no seasonal variation and a sinusoidal seasonal variation of death rate

Month	Live births 1979–2002	Observed SIDS 1979–2002	Expected SIDS by age distribution at death, 1979–2002, for no seasonal variation	Expected SIDS by cosine function model fit to observed SIDS 1979–2002*
*Observed monthly SIDS data modelled as 0.810+0.241[1+cosine 2π (t−30)/365.25].
January	37144	41	32.64	39.74
February	34710	43	32.29	36.21
March	36617	35	31.76	37.89
April	35945	42	31.58	33.49
May	36708	23	31.40	30.78
June	35580	24	31.42	26.55
July	37294	24	31.32	25.48
August	38045	27	31.57	25.46
September	39105	33	32.04	26.48
October	38719	31	32.54	30.68
November	36848	31	32.78	33.40
December	37984	30	32.63	37.82
Total	444699	384	384	384