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Table 1 Comparison of children with a follow-up at age 10 and the subset used in the analysis

From: IL13 gene polymorphisms modify the effect of exposure to tobacco smoke on persistent wheeze and asthma in childhood, a longitudinal study

  

Numbers at age 10 (%)

Numbers used in the analysis (%)

χ2 p value

Variable

Total

1,373

791

 

Wheeze Phenotype

Early-onset persistent*

139 (12.7)

105 (13.3)

0.60

 

Late-onset persistent†

81 (7.4)

70 (8.9)

 
 

Early transient‡

259 (23.6)

190 (23.9)

 
 

Non-wheezer§

617 (56.3)

426 (53.9)

 
 

Missing

277

0

 

Birth weight

≥2500 grams

1287 (96.3)

736 (96.0)

0.75

 

<2500 grams

49 (3.7)

31 (4.0)

 
 

Missing

37

24

 

Exposure to tobacco smoke

ETS-0

617 (45.2)

381 (48.2)

0.22

 

ETS-1

430 (31.5)

249 (31.5)

 
 

ETS-2

319 (23.3)

161 (20.3)

 
 

Missing

7

0

 

Gender

Girl Boy

676 (49.2)

388 (49.3)

0.98

  

697 (50.8)

399 (50.7)

 

Breast fed

≥3 months

470 (41.7)

322 (42.8)

0.67

 

<3 months

657 (58.3)

430 (57.2)

 
 

Missing

246

39

 

Household cat during pregnancy

Yes

453 (33.2)

269 (34.0)

0.68

 

No

912 (66.8)

521 (66.0)

 
 

Missing

8

1

 

Household dog during pregnancy

Yes

395 (28.9)

240 (30.4)

0.48

 

No

970 (71.1)

550 (69.6)

 
 

Missing

8

1

 
  1. * Onset of wheeze in the first 4 years, still present at age 10.
  2. † Onset of wheeze after age 4 years, still present at age 10.
  3. ‡ Wheeze only in the first 4 years.
  4. § No wheeze up to age 10.
  5. ETS-0, mothers did not smoke during pregnancy and children not exposed to household ETS; ETS-1, mothers did not smoke during pregnancy, but children were exposed to household ETS; ETS-2, mothers smoked during pregnancy and children were exposed to household ETS