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Table 2 Proportion and odds ratio of diarrhoea or fever among all illness types according to travel style and duration of travel

From: Travellers returning ill from the tropics – a descriptive retrospective study

  Diarrhoea Fever
Total 200 (56 %) Odds ratio compared to tourists 124 (34 %) Odds ratio compared to tourists
Travel style
Tourism (n = 210, 58 %) 109 (52 %) 1 61 (29 %) 1
Close contact to locals (n = 30, 8 %) 22 (73 %) 2.5 (95 % CI 1.1-6.0; p = 0.03) 15 (50 %) 2.4 (95 % CI 1.1-5.3; p = 0.02)
Work or study (n = 39, 11 %) 26 (67 %) 1.9 (95 % CI 0.9-3.8; p = 0.09) 18 (46 %) 2.1 (95 % CI 1.0-4.1; p = 0.04)
VFR (n = 31, 9 %) 12 (39 %) 0.6 (95 % CI 0.3-1.3; p = 0.17) 12 (39 %) 1.5 (95 % CI 0.7-3.4; p = 0.28)
Unknown (n = 50, 14 %) 31 (62 %) 1.5 (95 % CI 0.8-2.8; p = 0.20) 18 (36 %) 1.4 (95 % CI 0.7-2.6; p = 0.34)
Duration of travel (in days)   Odds ratio compared to ≤ 14 days   Odds ratio compared to ≤ 14 days
≤14 (n = 67, 19 %) 31 (46 %) 1 17 (25 %) 1
15 - 30 (n = 107, 30 %) 53 (50 %) 1.1 (95 % CI 0.6-2.1; p = 0.67) 29 (27 %) 1.1 (95 % CI 0.6-2.2; p = 0.81)
31 – 60 (n = 60, 17 %) 33 (55 %) 1.4 (95 % CI 0.7-2.9; p = 0.32) 26 (43 %) 2.3 (95 % CI 1.1-4.8; p = 0.03)
61 - 90 (n = 24, 6 %) 15 (63 %) 1.9 (95 % CI 0.7-5.0; p = 0.17) 13 (54 %) 3.5 (95 % CI 1.3-9.2; p = 0.01)
91 - 364 (n = 65, 18 %) 46 (71 %) 2.8 (95 % CI 1.4-5.8; p < 0.01) 28 (43 %) 2.2 (95 % CI 1.1-4.7; p = 0.03)
≥365 (n = 13, 4 %) 10 (77 %) 3.9 (95 % CI 1.0-15.3; p = 0.04) 6 (46 %) 2.5 (95 % CI 0.7-8.6; p = 0.121)
Unknown (n = 24, 6 %) 12 (50 %)   5 (21 %)  
  1. 1Fisher’s exact