Table 3 Standardised incidence ratios for subtypes of chronic obstructive pulmonary diseases in siblings
SubtypeMenWomenAll
OSIR (95% CI)OSIR (95% CI)OSIR (95% CI)
Obstructive chronic bronchitis2234.69 (2.89 to 7.56)2744.43 (2.77 to 7.05)4974.54 (2.93 to 7.01)
Emphysema386.70 (3.35 to 13.02)194.74 (2.02 to 10.50)575.89 (3.15 to 10.80)
  • O, observed number of cases; SIR, standardised incidence ratio; CI, confidence interval.

  • 95% CI does not include 1.00.