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. 2007 Apr 10;17(2):54–60. doi: 10.2188/jea.17.54

Table 3. Person-years, the number of incidence cases for chronic obstructive pulmonary disease (COPD) and incidence rate by sex and follow-up period.

Follow-up period Males Females
Person-years Number of
incidence cases
for COPD		 Incidence rate
(per 100 person-years)		 Person-years Number of
incidence cases
for COPD		 Incidence rate
(per 100 person-years)
Total 47,652 387 0.81 25,224 79 0.31
 
Less than 2 years
after baseline		 18,004 127 0.71 10,800 33 0.31
 
2 years or more
after baseline		 29,648 260 0.88 14,423 46 0.32