Table 4. The highest cross-correlation between syphilis incidence time series (the values in the brackets are the lags, the lags are 0 except between secondary and congenital syphilis).

	Primary	Secondary	Tertiary	Congenital	Latent
Primary	1	0.87(0)	0.95(0)	0.93(0)	0.97(0)
Secondary		1	0.79(0)	0.77(-2)	0.76 (0)
Tertiary			1	0.90(0)	0.95(0)
Congenital				1	0.96(0)
Latent					1