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Table 6 Clinician assessment of cause of asthma onset

From: A longitudinal study of adult-onset asthma incidence among HMO members

Cause of Morbidity* Total Cases, N (%) New-onset Cases N (%) Reactivated Cases N (%) Relative Risk,** [95% C.I.]
   Infection Induced 275 (59) 144 (70) 131 (51) 1.4, [1.2, 1.6]
   Allergy Induced 63 (14) 19 (9) 44 (17) 0.54, [0.32, 0.89]
   Exercise Induced 20 (4) 9 (4) 11 (4) 1.02, [0.43, 2.41]
   Other 23 (5) 12 (6) 11 (4) 1.36, [0.61, 3.02]
   No Etiology Given 84 (18) 23 (11) 61 (24) 0.47, [0.30, 0.73]
   Total 465* 207 258  
  1. *4 missing observations **Unadjusted Relative Risk, New-onset cases versus reactivated cases with reference group representing all other etiologic categories combined, including "no etiology given"