Temporal patterns of suicide and circulatory system disease-related mortality are inversely correlated in several countries

Table 2 Estimates of peak and nadir months, rate ratios, and temporal cross-correlation coefficients between mortality types

	Circulatory disease-related			Suicide
Country	Peak	Nadir	RR (95% CI)	Peak	Nadir	RR (95% CI)	Correl. (95% CI)
Australia	July	Jan.	1.29 (1.26, 1.31)	Dec.	June	1.14 (1.11, 1.18)	−0.32 (−0.44, −0.19)
Brazil	July	Jan.	1.16 (1.14, 1.18)	Dec.	June	1.12 (1.10, 1.15)	−0.57 (− 0.71, − 0.38)
England & Wales	Jan.	July	1.29 (1.24, 1.33)	April	Oct.	1.08 (1.04, 1.12)	0.14 (−0.12, 0.38)
South Korea	Jan.	July	1.29 (1.26, 1.32)	June	Dec.	1.27 (1.21, 1.33)	−0.32 (− 0.42, − 0.20)
United States	Jan.	July	1.22 (1.20, 1.23)	July	Jan.	1.13 (1.11, 1.14)	−0.66 (− 0.75, − 0.56)

Legend: Jan. January, Oct. October, Dec. December; RR Rate ratio comparing the relative mortality rate at the peak month to the mortality rate at the nadir month; Correl. Cross-correlation between monthly suicide and circulatory system disease-related mortality over time. Note: All analyses have been adjusted to account for the uneven number of days in the month, so that monthly mortality rates have been scaled to an average month of length of 30-days

ISSN: 1471-244X