TABLE 3.

Economy of discards (In terms of no. of units collected)

Year	Total	Expiry	HIV	HBsAg	Syphilis
1995 Jun+	54	39	5	9	1
1996	34	27	2	4	1
1997	76	71	1	4	0
1998	67	58	1	5	3
1999	61	47	8	2	4
Total	292	242	17	24	9

(Discard due to non-utilisation and discard due to screening)

Paired t-test : t=4.511096; df=4; p=0.010731)