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Table 1 Comparison of HIV and STI testing of HIV negative MSM attending two general practices during three one-year periods

From: Introduction of a sexual health practice nurse is associated with increased STI testing of men who have sex with men in primary care

Clinic A: Nurse introduced in Period 3 n nt(%) 95% CI % Difference Period 1 to Period 2 % Difference Period 2 to Period 3
HIV antibody      
Period 1 1000 504 (50) 47-54   
Period 2 1011 523 (52) 49-55 2 ( p = 0.39)  
Period 3 1042 596 (57) 54-60   5 ( p = 0.026)
Syphilis EIA #      
Period 1 1000 522 (52) 49-55   
Period 2 1011 534 (53) 50-56 1( p = 0.69)  
Period 3 1042 630 (60) 57-63   7 ( p < 0.01)
Urine Test      
Period 1 1000 526 (53) 50-56   
Period 2 1011 572 (57) 54-60 4 (p = 0.08)  
Period 3 1042 649 (62) 59-65   5 ( p = 0.024)
Anal Swab      
Period 1 1000 477 (48) 45-51   
Period 2 1011 506 (50) 47-53 2 (p = 0.39)  
Period 3 1042 590 (57) 54-60   7 (p < 0.01)
Complete Tests*      
Period 1 1000 383 (38) 35-41   
Period 2 1011 411 (41) 38-44 3 (p = 0.18)  
Period 3 1042 489 (47) 44-50   6 ( p < 0.01)
Clinic B: No Nurse n n t (%) 95% CI % Difference Period 1 to Period 2 % Difference Period 2 to Period 3
HIV antibody      
Period 1 3664 1429 (39) 37- 41   
Period 2 3836 1643 (43) 41- 45 4 ( p < 0.001)  
Period 3 3870 1442 (37) 35- 39   −6 (p < 0.001)
Syphilis EIA #      
Period 1 3664 1498 (41) 39- 43   
Period 2 3836 1711 (45) 43- 47 4 (p < 0.001)  
Period 3 3870 1549 (40) 38- 42   −5 (p < 0.001)
Urine Test      
Period 1 3664 1345 (37) 35-39   
Period 2 3836 1542 (40) 38-42 3 (p < 0.001)  
Period 3 3870 1369 (35) 34-36   −5 ( p < 0.01)
Anal Swab      
Period 1 3664 922 (25) 22-26   
Period 2 3836 1148 (30) 29- 31 5 ( p < 0.001)  
Period 3 3870 1022 (26) 25- 27   −4 (p < 0.001)
Complete Tests*      
Period 1 3664 755 (21) 20-22   
Period 2 3836 971 (25) 24-26 4 (p < 0.001)  
Period 3 3870 883 (23) 22-24   - 2 (p < 0.01)
  1. n = number of MSM.
  2. nt = number of test.
  3. # EIA = Enzyme-linked Immunoassay.
  4. *Complete Tests = HIV antibodies; syphilis EIA; urine test for chlamydia and an anal swab for chlamydia and gonorrhoea collected on the same date.