Table 2

Prevalence and odds ratio (OR) of airway symptoms according to exposure from oil tank explosion
Main group analysis Sub-group analysis
Control Exposed Exposed (<6 km) vs control Exposed 3–6 km Exposed (3-6km) vs control Exposed <3 km Exposed (<3km) vs control Linear trend:control/3-6 km/<3 km
n = 179 n = 223 n = 114 n = 109
n (%) n (%) OR (95% CI)ab % OR (95% CI)ab % OR (95% CI)ab P-valueb
Blocked nose 37 (21) 71 (32) 1.7 (1.0, 2.8) 28 1.5 (0.8, 2.6) 36 2.0 (1.1, 3.6) 0.020
Rhinorrhoea 24 (13) 52 (23) 1.9 (1.1, 3.4) 21 1.6 (0.9, 3.1) 26 2.4 (1.2, 4.6) 0.010
Irritated nose 24 (13) 79 (35) 3.4 (2.0, 5.9) 34 3.2 (1.7, 5.9) 37 3.7 (2.0, 7.0) <0.001
Sore throat 22 (12) 73 (33) 3.1 (1.8, 5.5) 34 3.4 (1.8, 6.3) 31 2.9 (1.5, 6.6) 0.001
Morning cough 26 (15) 74 (33) 3.5 (2.0, 6.2) 33 3.0 (1.6, 5.7) 33 4.3 (2.2, 6.7) <0.001
Daily cough 42 (24) 91 (42) 2.3 (1.4, 3.7) 38 1.8 (1.0, 3.1) 46 3.0 (1.7, 6.4) <0.001
Cough > 3 mo/yr 21(12) 64 (29) 2.9 (1.5, 5.3) 24 2.1 (1.0, 4.3) 34 4.1 (2.0, 8.4) <0.001
Cough with phlegm 45 (26) 82 (38) 1.9 (1.2, 3.1) 39 1.8 (1.0, 3.2 37 2.1 (1.2, 3.8) 0.010
Cough with phlegm > 3 mo/yr 11 (6) 39 (17) 2.9 (1.3, 6.2) 13 1.6 (0.6, 3.8) 22 5.7 (2.3, 14.2) <0.001
Dyspnoeic walking flat 13 (7) 30 (14) 1.8 (0.9, 3.8) 15 1.8 (0.8, 4.0) 12 1.9 (0.8, 4.5) 0.132
Dyspnoeic walking uphill 44 (25) 75 (35) 1.5 (0.9, 2.4) 33 1.3 (0.7, 2.3) 37 1.7 (0.95, 3.0) 0.075
Ever chest wheeze 21 (12) 36 (16) 1.7 (0.8, 3.2) 15 1.3 (0.6, 2.9) 17 2.2 (0.98, 4.9) 0.061

Exposed status was defined as living <6 km (average 3.7 km) from the explosion site; control status as living >20 km (average 28 km) from the explosion site. Increasing intensity of exposure within the exposed group was defined by dividing the exposed group in those living 3–6 km (average 4.7 km) and <3 km (average 2.6 km) from the explosion site.

a Odds ratio (95% confident interval). bLogistic regression models with adjustment for smoking, occupational exposure, atopy (defined by Phadiatop®), infection in the preceding month, post-traumatic stress impact score, age and gender.

Granslo et al.

Granslo et al. BMC Pulmonary Medicine 2012 12:76   doi:10.1186/1471-2466-12-76

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