Table 2.

Variance of mean proximal humeral fracture incidence between months

	Variancea	Variance between monthsb
	p-value	Peak monthc	Lower month(s)d	p-value
All	< 0.001	Jan	All except Dec	All ≤ 0.037
Men	0.022	Dec	Nov	≤ 0.030
Women	< 0.001	Jan	All except Dec	All ≤ 0.017
≥ 50 year	< 0.001	Jan	All except Dec	All ≤ 0.020
< 50 year	0.408	Sept	n/a	n/a
1944-1995 e	< 0.001
2005-2020 e	0.228

^a ANOVA. ^b Tukey´s test. ^c Month with highest mean incidence. ^d Month(s) with statistically significantly lower incidence than peak month.

^e Variance between month-groups (Jan + Dec compared to Feb-Nov).

Sex-, age-group- and year-group-specific monthly variance of mean proximal humeral fracture incidence and variance between months in Malmö, Sweden 1944–2020.