Table 4.

Posterior mean and 95% highest posterior density intervals for the total PWID population size in Scotland (to nearest 100) for the years 2003, 2006 and 2009 using the INC-C, REM-C and IGN-C methods.

Year	INC-C		REM-C		IGN-C
	Posterior mean	95% HPDI	Posterior mean	95% HDPI	Posterior mean	95% HDPI
2003	16 700	(14 300, 20 900)	16 500	(14 200, 20 800)	27 500	(20 700, 32 300)
2006	22 900	(16 300, 27 000)	24 000	(19 500, 29 700)	31 000	(24 600, 37 700)
2009	15 200	(11 500, 18 600)	16 000	(11 500, 19 400)	31 000	(24 000, 38 900)

HPDI, highest posterior density interval.