Table 1

 Demographic, clinical and behavioural baseline characteristics of 16–24-year-old women screened for chlamydia, grouped by recruitment status, baseline infection and healthcare setting, England, March 2002–August 2003

CharacteristicWomen with negative chlamydia testWomen with positive chlamydia test
Not recruitedRecruitedNot recruitedRecruited
n (column %)n (column %)n (column %)n (column %)
*Reason for attendance: screening  =  pre-termination, pre-IUD, pre-uterine instrumentation, repeat risk, all other screening or last test equivocal; symptoms  =  current genital tract symptoms; other reason  =  referral with chlamydia positive, test of cure, partner of chlamydia positive, emergency contraception.
†χ2 test between recruited and not recruited population was p<0.05.
Total51041424511547
General practice1620353101125
    Age group (years)
        16–19663 (40.9)137 (38.8)45 (44.6)48 (38.4)
        20–24957 (59.1)216 (61.2)56 (55.4)77 (61.6)
    Ethnic group
        White1021 (63.0)244 (69.1)†51 (50.5)91 (72.8)†
        Other ethnicity30 (1.9)2 (0.6)1 (1.0)0 (0.0)
        Unknown569 (35.1)107 (30.3)49 (48.5)34 (27.2)
    Reason for attendance*
        Screening993 (61.3)259 (73.4)†53 (52.5)86 (68.8)
        Symptoms195 (12.0)32 (9.1)12 (11.9)9 (7.2)
        Other reason13 (0.8)5 (1.4)8 (7.9)5 (4.0)
        Unknown419 (25.9)57 (16.1)28 (27.7)25 (20.0)
    Symptoms (yes, past 6 months)
        Discharge332 (20.5)74 (21.0)23 (22.8)32 (25.6)
        Pelvic pain247 (15.2)59 (16.7)17 (16.8)20 (16.0)
        Cystitis155 (9.6)28 (7.9)7 (6.9)14 (11.2)
        Irregular bleeding212 (13.1)†30 (8.5)19 (18.8)19 (15.2)
        Any of above symptoms596 (36.8)122 (34.6)39 (38.6)53 (42.4)
    Treatment completion (positives only)93 (92.1)125 (100)
    Mean number of partners, past 3 months (positives only)(n = 61) 1.15(n = 111) 1.08
    Family planning1,768546126198
    Age group (years)
        16–191010 (57.1)312 (57.1)66 (52.4)142 (71.7)†
        20–24758 (42.9)234 (42.9)60 (47.6)56 (28.3)
    Ethnic group
        White1314 (74.3)433 (79.3)†82 (65.1)168 (84.8)†
        Other ethnicity28 (1.6)5 (0.9)2 (1.6)2 (1.0)
        Unknown426 (24.1)108 (19.8)42 (33.3)28 (14.1)
    Reason for attendance*
        Screening1434 (81.1)422 (77.3)†89 (70.6)152 (76.8)
        Symptoms145 (8.2)32 (5.9)18 (14.3)21 (10.6)
        Other reason47 (2.7)18 (3.3)7 (5.6)10 (5.1)
        Unknown142 (8.0)74 (13.6)12 (9.5)15 (7.6)
    Symptoms (yes, past 6 months)
        Discharge303 (17.1)79 (14.5)26 (20.6)44 (22.2)
        Pelvic pain280 (15.8)69 (12.6)24 (19.0)35 (17.7)
        Cystitis179 (10.1)74 (13.6)†15 (11.9)26 (13.1)
        Irregular bleeding258 (14.6)75 (13.7)21 (16.7)37 (18.7)
        Any of above symptoms654 (37.0)191 (35.0)54 (42.9)86 (43.4)
    Treatment completion (positives only)117 (92.9)194 (98.0)
    Mean number of partners, past 3 months (positives only)(n = 79) 1.19(n = 182) 1.30
    Genitourinary medicine1716525284224
    Age group (years)
        16–19707 (41.2)218 (41.5)122 (43.0)114 (50.9)
        20–241009 (58.8)307 (58.5)162 (57.0)110 (49.1)
    Ethnic group
        White1476 (86.0)347 (66.1)†245 (86.3)163 (72.8)†
        Other ethnicity40 (2.3)6 (1.1)7 (2.5)4 (1.8)
        Unknown200 (11.7)172 (32.8)32 (11.3)57 (25.4)
    Reason for attendance*
        Screening1238 (72.1)311 (59.2)†176 (62.0)119 (53.1)
        Symptoms253 (14.7)153 (29.1)49 (17.3)47 (21.0)
        Other reason56 (3.3)5 (1.0)41 (14.4)37 (16.5)
        Unknown169 (9.8)56 (10.7)18 (6.3)21 (9.4)
    Symptoms (yes, past 6 months)
        Discharge380 (22.1)126 (24.0)74 (26.1)70 (31.3)
        Pelvic pain142 (8.3)52 (9.9)20 (7.0)29 (12.9)†
        Cystitis135 (7.9)43 (8.2)30 (10.6)23 (10.3)
        Irregular bleeding132 (7.7)56 (10.7)†39 (13.7)29 (12.9)
        Any of above symptoms564 (32.9)175 (33.3)105 (37.0)93 (41.5)†
    Treatment completion (positives only)280 (98.6)220 (98.2)
    Mean number of partners, past 3 months (positives only)(n = 259) 1.26(n = 211) 1.22