Table 1 Risk factors for infection with Mycoplasma genitalium or Chlamydia trachomatis in 249 female students (p value was analysed with Fisher’s exact test)
M genitaliumC trachomatis
Negative (%)Positive (%)p ValueNegative (%)Positive (%)p Value
Total (249)242 (97.2)7 (2.8)227 (91.2)22 (8.8)
Age 18–19 year (102)99 (97.1)3 (2.9)91 (89.2)11 (10.8)
    20–21 year (114)111 (97.4)3 (2.6)104 (91.2)10 (8.8)
    >21 year (33)32 (97.0)1 (3.0)0.9932 (97.0)1 (3.0)0.39
History of genital symptoms
    No (214)207 (96.7)7 (3.3)0.60196 (91.6)18 (8.4)0.53
    Yes (35)35 (100)031 (88.6)4 (11.4)
History of any STI
    No (217)211 (97.2)6 (2.8)0.64199 (91.7)18 (8.3)0.65
    Yes (32)31 (96.9)1 (3.1)28 (87.5)4 (12.5)
Numbers of lifetime partners
    1–2 (90)90 (100)087 (96.7)3 (3.3)
    3–4 (56)56 (100)048 (85.7)8 (14.3)<0.01
    ⩾5 (103)96 (93.2)7 (6.8)<0.0192 (89.3)11 (10.7)0.05
Age at the first intercourse
    ⩽16 year (122)117 (95.9)5 (4.1)109 (89.3)13 (10.7)
    17–18 year (98)96 (98.0)2 (2.0)91 (92.9)7 (7.1)
    ⩾19 year (29)29 (100)00.4127 (93.1)2 (6.9)0.61
Sexual partners in the 6 months
None (41)41 (100)040 (97.6)1 (2.4)
    1 (143)140 (97.9)3 (2.1)133 (93.0)10 (7.0)
    ⩾2 (65)61 (93.8)4 (6.2)0.1354 (83.1)11 (16.9)0.02
New sexual partners in the previous 6 months
    No (163)160 (98.2)3 (1.8)0.23152 (93.3)11 (6.7)0.16
    Yes (86)82 (95.3)4 (4.7)75 (88.4)11 (11.6)
Condom use
    Not always (172)166 (96.5)6 (3.5)0.58153 (89.0)19 (11.0)0.11
    Always (77)76 (98.7)1 (1.3)74 (96.1)3 (3.9)
C trachomatis positive
    No (227)223 (98.2)4 (1.8)0.01
    Yes (22)19 (86.4)3 (13.6)