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Table 1 Characteristics of Toronto School Children with Asthma Questionnaire and Health Claims Data, 2006a

From: Verifying a questionnaire diagnosis of asthma in children using health claims data

Variable Respondents
n = 2884
n (%)
Non-respondents
n = 2735
n (%)
P-value
Physician Diagnosis of asthma (n = 5461) 438 (15.71%) 409 (15.34%) 0.73
Male sex (n = 5573) 1459 (50.84%) 1313 (48.58%) 0.09
Mean age in years (n = 4781) 6.75 6.72 0.20
Income adequacy (n = 5241)    <0.0001
Lowest income 469 (16.82%) 466 (19.00%)  
Lower middle 568 (20.37%) 592 (24.14%)  
Upper middle 577 (20.69%) 624 (25.45%)  
Highest income 1175 (42.13%) 770 (31.40%)  
Highest level of education (n = 5421)    <0.0001
Less than high school 189 (6.75%) 267 (10.19%)  
Completed high school 278 (9.92%) 340 (12.98%)  
Completed postsecondary education 879 (31.37%) 962 (36.73%)  
Completed post graduate education 1456 (51.96%) 1050 (40.09%)  
Number of visits to health care provider in the last year (n = 5237)    <0.0001
0 678 (24.85%) 742 (29.57%)  
1-4 1471 (53.92%) 1213 (48.35%)  
>=5 579 (21.22%) 554 (22.08%)  
Physician visits in last year (n = 5237)    <0.0001
No regular physician 678 (24.85%) 742 (29.57%)  
Pediatrician only 936 (34.31%) 771 (30.73%)  
General Practitioner only 486 (17.82%) 375 (14.95%)  
Pediatrician & General Practitioner 628 (23.02%) 621 (24.75%)  
Environmental tobacco smoke exposure in home (n = 5383) 302 (10.94%) 328 (12.51%) 0.07
  1. aRespondents are T-CHEQ participants who agreed to health claims data linkage while non-respondents did not agree and are therefore not included in the study population. The T-CHEQ study was a population-based sample.