Table 3– Chronic bronchitis# in subjects without chronic obstructive pulmonary disease by study site
Total nProportion with chronic bronchitisAdjusted proportion+
n (%)(95% CI)%(95% CI)
 Saõ Paulo, Brazil81140 (4.9)(3.3–6.5)7.9(6.6–9.4)
 Santiago, Chile97599 (10.2)(8.4–11.9)7.0(6.1–8.0)
 Mexico City, Mexico92262 (6.7)(5.0–8.4)6.2(5.5–7.1)
 Montevideo, Uruguay70933 (4.7)(3.1–6.2)5.5(4.7–6.6)
 Caracas, Venezuela113650 (4.4)(2.9–5.9)4.9(3.9–6.3)
Total4553284 (6.2)(5.5–7.0)6.2(5.5–7.0)
  • #: defined as phlegm on most days, at least 3 months per year for ≥2 yrs; : there were significant differences between Santiago and all other sites versus Mexico City (p=0.0069) versus all other sites (p<0.0001); overall p<0.0001; +: of persons with chronic bronchitis adjusted for age and sex assessed using the Wald test and adjusted for survey design.