Table 1

Description of testing patterns, proportion of positives, and chlamydia isolation rate

Number of samples takenTests per 1000 women (SD)Percentage of tests positive (SD)Chlamydia isolation rate per 1000 women
*Sum of all tests by category may not equal 7172 where practice characteristic data are missing.
All717266.1 (81.4)5.0 (4.6)1.3 (1.5)
    Under 15461.0 (1.9)1.1 (6.0)na
    15–1982947.0 (71.3)13.3 (18.2)5.5 (8.2)
    20–24177581.7 (103.0)8.2 (9.1)8.2 (10.6)
    25–29132065.8 (62.5)4.9 (9.1)3.5 (6.7)
    30+320219.9 (19.4)1.4 (3.2)0.2 (0.6)
Townsend category*
    −3.4–0295122.3 (19.6)4.7 (4.8)0.8 (1.0)
    0–3.9295324.5 (25.4)4.1 (3.4)1.3 (1.7)
    3.9–5.396234.2 (22.7)7.5 (4.8)2.4 (1.8)
List size*
    758–126366933.1 (31.6)5.0 (5.4)1.6 (2.0)
    1263–177377424.7 (21.8)5.3 (5.0)1.4 (1.8)
    1774–256567316.3 (19.4)3.4 (4.3)0.7 (0.8)
    2566–3924138521.8 (15.8)6.0 (3.4)1.3 (2.1)
    3925–11293303928.3 (22.0)4.7 (3.7)1.2 (1.3)
Ratio of full time equivalent nurses per 1000 female practice population*
    0–0.44148318.5 (10.8)6.4 (4.4)1.1 (1.7)
    0.45–0.54150423.6 (17.8)4.1 (3.2)0.9 (0.8)
    0.55–0.69105818.8 (16.8)4.6 (5.0)1.0 (1.4)
    0.69–0.90157131.6 (29.3)5.8 (4.1)1.8 (2.1)
    0.90–2.0878232.2 (33.3)3.3 (4.8)1.2 (1.9)
Ratio of female GP partners per 1000 female practice population*
    0–0.32192720.1 (22.6)4.8 (5.0)1.1 (1.7)
    0.33–0.49166721.5 (18.9)4.2 (3.2)1.0 (0.8)
    0.50–0.69138327.3 (15.1)5.2 (3.9)1.4 (1.5)
    0.70–2.12156334.9 (30.3)5.2 (5.0)1.6 (1.7)
Ratio of all GP partners per 1000 female practice population*
    0.596–0.890134922.1 (24.8)4.4 (4.6)0.9 (1.3)
    0.900–1.00191416.9 (9.9)6.8 (4.5)1.0 (0.8)
    1.002–1.160141619.5 (12.9)4.7 (3.8)1.1 (1.2)
    1.161–1.428133824.0 (17.5)4.4 (4.9)1.1 (1.5)
    1.429–4.300151943.1 (33.2)4.5 (4.1)2.1 (2.2)