Table 1

Baseline characteristics

Requesting dates6 September 2016–
1 November 2017
3 November 2017–
2 January 2019
6 September 2016–
2 January 2019
p value
(MT vs DBS)
5670 DatasetsEDTA MT kit (1515), n (%)*DBS kit (4155), n (%)*Combined kits (5670), n (%)*
Sex
 Male460 (30.4)1357 (32.6)1817 (32.0)0.100
 Female1051 (69.4)2788 (67.1)3839 (67.7)0.110
 Transgender0 (0.0)2 (0.05)†2 (0.04)†1.000
 Other gender identity4 (0.2)8 (0.2)12 (0.2)0.540
Age (years), mean (95% CI)27.4 (27.1 to 27.8)27.3 (27.1 to 27.5)27.3 (27.1 to 27.5)
Age (years), median (IQR)26 (22–31)26 (22–31)26 (22–31)
Ethnicity
 Any other Asian background2 (0.1)5 (0.1)7 (0.1)1.000
 Any other black background6 (0.4)21 (0.5)27 (0.5)0.600
 Any other mixed background11 (0.7)30 (0.7)41 (0.7)0.990
 Any other white background41 (2.7)105 (2.5)146 (2.6)0.710
 Bangladeshi6 (0.4)12 (0.3)18 (0.3)0.530
 Black African25 (1.6)104 (2.5)129 (2.3)0.570
 Black Caribbean81 (5.3)246 (5.9)327 (5.7)0.410
 Chinese1 (0.06)†7 (0.2)8 (0.1)0.690
 Indian51 (3.4)111 (2.7)162 (2.9)0.160
 Pakistani13 (0.9)45 (1.1)58 (1.0)0.460
 Unknown/not specified26 (1.7)78 (1.9)104 (1.8)0.690
 White and Asian17 (1.1)51 (1.2)68 (1.2)0.750
 White and black African2 (0.1)9 (0.2)11 (0.2)0.740
 White and black Caribbean79 (5.2)271 (6.5)350 (6.2)0.700
 White British1147 (75.7)3044 (73.2)4191 (74.0)0.630
 White Irish7 (0.5)16 (0.4)23 (0.4)0.690
Sexuality
 Heterosexual man353 (23.3)1012 (24.3)1365 (24.1)0.410
 Heterosexual woman977 (64.5)2617 (63.0)3594 (63.4)0.300
 Bisexual man20 (1.3)67 (1.6)87 (1.5)0.430
 Bisexual woman
 Percentage difference (95% CI)*
18 (1.2)95 (2.3)113 (2.0)0.009
1.1 (0.4 to 1.8)
 MSM exclusive87 (5.7)278 (6.7)365 (6.4)0.200
 WSW exclusive
 Percentage difference (95% CI)*
56 (3.7)76 (1.8)132 (2.3)<0.001
1.9 (−2.9 to 0.8)
 Heterosexual TG woman0 (0.0)2 (0.05)†2 (0.04)†1.000
 Unknown/not specified4 (0.2)8 (0.2)12 (0.2)0.600
  • p values in bold typeface denote statistical significance; p values rounded to three decimal places.

  • For proportion percentage differences with 95% CI; negative values favour MT, positive values favour DBS.

  • *Rounded to one decimal place.

  • †Rounded to two decimal places for representation.

  • DBS, dried blood spot; MSM, men who have sex with men; MT, mini tube; TG, transgender; WSW, women who have sex with women.