Table 1

Tango's statistics for detecting time clustering

	Subgroup	Tango’s index (measured)	Tango’s index (expected)	P value
All	–	0.1669	0.1676	0.992
	00–19 years	0.1702	0.1680	0.007
	20–39 years	0.1657	0.1679	1.000
	40–59 years	0.1674	0.1678	0.721
	≥60 years	0.1685	0.1678	0.140