Table 2 Differences between traced and untraced index case populations and contact and secondary case populations for key characteristics. Key: 1 mean, median (IQR); 2 Welch two sample t-test, Pearson’s Chi-squared test
Characteristic | Traced n = 13,616 (%) | Not traced n = 11,307 (%) | p value 2 | Contacts only n = 662,560 (%) | Secondary cases n = 5,289 (%) | p value 2 | |
|---|---|---|---|---|---|---|---|
Age | 38, 37 (22, 52)1 | 41, 43 (27, 56) 1 | < 0.001 | 44, 43 (30, 56)1 | 46, 46 (33, 57) 1 | < 0.001 | |
Sex | < 0.001 | < 0.001 | |||||
Female | 2,256 (17) | 2,130 (19) | 42,052 (6) | 389 (7) | |||
Male | 2,408 (18) | 2,328 (21) | 45,329 (7) | 476 (9) | |||
Unknown | 8,952 (66) | 6,849 (61) | 575,179 (87) | 4,424 (84) | |||
Number of vaccinations | < 0.001 | < 0.001 | |||||
None | 2,414 (18) | 1,292 (11) | 50,034 (7.6) | 604 (11) | |||
Partially (one) | 850 (6.2) | 398 (3.5) | 18,725 (2.8) | 166 (3.1) | |||
Fully (two) | 8,133 (60) | 8,301 (73) | 331,447 (50) | 2,374 (45) | |||
Unknown | 2,219 (16) | 1,316 (12) | 262,354 (40) | 2,145 (41) | |||