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Table 5 Prevalence of self-reported current rhinoconjunctivitis along with crude and adjusted odd ratios

From: Allergic rhinitis, rhinoconjunctivitis and hayfever symptoms among children are associated with frequency of truck traffic near residences: a cross sectional study

Variable

Totala

Allergic rhino-conjunctivitis (%)

Crude OR (95 % CI)

P

Adjusted OR (95 % CI)b

P

Mode of transport to school

Walk

1728

20.7

1

 

1

 

Taxi/Bus

708

22.3

1.09 (0.88–1.35)

0.387

1.06 (0.84–1.33)

0.615

Motor car

683

24.6

1.25 (1.01–1.54)

0.033

1.19 (0.87–1.62)

0.260

Combination

201

26.4

1.53 (1.10–2.12)

0.011

1.44 (0.98–2.11)

0.054

Other

100

27.0

1.46 (0.92–2.30)

0.105

1.57 (0.96–2.57)

0.068

Frequency of trucks passing near homes on weekdays

Never

563

18.8

1

 

1

 

Seldom

1033

23.0

1.23 (0.95–1.59)

0.113

1.17 (0.89–1.54)

0.234

Frequently through the day

580

19.0

1.01 (0.75–1.37)

0.904

0.96 (0.70–1.30)

0.799

Almost all day

1212

25.7

1.54 (1.20–1.97)

0.001

1.42 (1.09–1.84)

0.008

Sex

Female

1790

25.8

1

 

1

 

Male

1634

18.9

0.67 (0.57–0.79)

0.000

0.68 (0.57–0.81)

0.000

Being born in Tembisa/Kempton park areas

No

1609

20.7

1

 

1

 

Yes

1812

24.0

1.27 (1.07–1.50)

0.004

1.22 (1.02–1.45)

0.024

Vigorous physical activity

Never or occasionally

984

18.4

1

 

1

 

Once or twice per week

1417

24.8

1.45 (1.19–1.78)

0.000

1.42 (1.16–1.76)

0.001

3 or more times per week

983

23.3

1.33 (1.06–1.65)

0.011

1.34 (1.06–1.68)

0.012

Hours watching TV during normal week

Less than 1 h

532

19.6

  

1

 

1 h but less than 3 h

835

19.8

0.97 (0.74–1.28)

0.873

0.93 (0.69–1.24)

0.622

3 h but less than 5 h

827

23.1

1.20 (0.91–1.57)

0.180

1.15 (0.87–1.53)

0.313

5 h or more

1213

25.1

1.37 (1.07–1.77)

0.012

1.37 (1.06–1.78)

0.016

Residential heating fuel type most frequently used

Electricity

2041

21.5

1

 

1

 

Gas

426

29.3

1.50 (1.18–1.89)

0.001

1.45 (1.14–1.85)

0.002

Paraffin

631

20.1

0.96 (0.76–1.22)

0.760

0.95 (0.75–1.22)

0.739

Open fires (wood, coal)

270

24.1

1.18 (0.87–1.59

0.276

1.18 (0.86–1.61)

0.291

  1. aTotals for each risk factor are different due to difference in missing values
  2. bModel adjusted for all the variables in this table