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Table 2 Prevalence of exposure to second hand smoke at home and in public places, Hanwella, Colombo, Sri Lanka

From: Prevalence and correlates of exposure to second hand smoke (SHS) among 14 to 15 year old schoolchildren in a medical officer of health area in Sri Lanka

Factors Home Public Places
Exposed n (%) Not exposed n (%) Significance testing Exposed n (%) Not exposed n (%) Significance testing
Total 54 (17.6) 252 (82.4) P1 < 0.0001 80 (25.7) 231 (74.3) P1 < 0.0001
Sex
 Female 31 (20.0) 124 (80.0) χ2 = 1.19, df = 1, p = 0.27 45 (28.3) 114 (71.7) χ2 = 1.13, df = 1, p = 0.29
 Male 23 (15.2) 128 (84.8) 35 (23.0) 117 (77.0)
Age
 14 years 30 (17.4) 143 (82.7) χ2 = 0.02, df = 1, p = 0.87 40 (23.0) 134 (77.0) χ2 = 1.07,df = 1, p = 0.30
 15 years 24 (18.0) 109 (82.0) 38 (28.1) 97 (71.9)
Ethnicity
 Sinhalese 42 (18.8) 182 (81.2) χ2 = 1.24, df = 1, p = 0.27 52 (22.9) 175 (77.1) χ2 = 5.06, df = 1, p = 0.02
 Non- Sinhalese 10 (13.2) 66 (86.6) 28 (35.9) 50 (64.1)
Presence of smokers in household
 Present 24 (50.0) 24 (50.0) χ2 = 41.0, df = 1, p < 0.001 20 (41.7) 28 (58.3) χ2 = 8.6, df = 1, p = 0.003
 Not present 30 (11.6) 228 (88.4) 56 (21.7) 202 (78.3)
Employment status of father
 Employed 50 (17.9) 230 (82.1) χ2 = 0.3, df = 1, p = 0.58 73 (25.6) 212 (74.4) χ2 = 0.25, df = 1, p = 0.62
 Unemployed 14 (87.4) 2 (12.5) 5 (31.2) 11 (68.8)
Employment status of mother
 Employed 33 (14.9) 188 (85.1) χ2 = 6.7, df = 1, p = 0.01 53 (23.5) 173 (76.5) χ2 = 3.9, df = 1, p = 0.05
 Unemployed 21 (28.4) 53 (71.6) 26 (35.1) 48 (64.9)
  1. χ2 Chi Square value, df degree of freedom, p significance, p1 based on difference between two proportions
  2. Exposure to SHS at home - sex 5, age 5, ethnicity 11, presence of smokers 5, father’s employment status 15, mother’s employment status 16
  3. Exposure to SHS in enclosed public places - age 2, ethnicity 6, presence of smokers 5, father’s employment status 10, mother’s employment status 11