Table 1

Preferences for STI testing characteristics, expressed as ORs

Attributes and levelsUnadjusted ORsp ValueAdjusted ORs*p Value
Time to appointment
 Drop in same day and wait1.36 (1.28 to 1.45)<0.0011.36 (1.27 to 1.45)<0.001
 Within 24 h1.27 (1.21 to 1.35)<0.0011.27 (1.20 to 1.35)<0.001
 Within 48 h1.01.0
 After 48 h but at individuals convenience1.06 (1.00 to 1.11)0.0271.04 (0.99 to 1.10)0.11
Results waiting time
 Same day1.61 (1.52 to 1.72)<0.0011.65 (1.55 to 1.77)<0.001
 3 days1.24 (1.18 to 1.31)<0.0011.26 (1.19 to 1.33)<0.001
 7 days1.01.0
 21 days0.63 (0.59 to 0.66)<0.0010.62 (0.58 to 0.65)<0.001
Comprehensive of results
 Positive results only1.01.0
 Positive and negative results1.25 (1.21 to 1.28)<0.0011.24 (1.21 to 1.29)<0.001
Staff
 Staff without specialist STI knowledge1.01.0
 Staff with specialist STI knowledge2.55 (2.47 to 2.63)<0.0012.64 (2.56 to 2.73)<0.001
Comprehensiveness of testing
 Tests for most STIs1.01.0
 Tests for all STIs2.19 (2.12 to 2.25)<0.0012.23 (2.16 to 2.31)<0.001
Results reporting method
 Phone up test centre1.01.0
 Post to home address0.82 (0.78 to 0.86)<0.0010.81 (0.77 to 0.86)<0.001
 By email0.94 (0.88 to 1.00)0.0360.94 (0.88 to 1.00)0.055
 Text or call to mobile phone by centre1.02 (0.97 to 1.08)0.481.00 (0.95 to 1.06)0.97
  • Figures in brackets represent 95% CIs. For the main unadjusted model: constant, OR 0.70 (0.68 to 0.72), log-likelihood =−14 047, no. of observations = 26 538, no. of groups (participants) =3355, average no. of DCE questions completed per participant =99%, ρ=3.90×107, p=0.49, McFadden's adjusted r2=0.22, the model predicts 74% of answers correctly.

  • * Adjusted for age, sex, CASH, MSM, no. of previous tests, symptoms of STIs, educations and employment status.

  • Excluded tests were syphilis, herpes and HIV.

  • DCE, discrete choice experiment; MSM, men who have sex with men; STI, sexually transmitted infection.