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. Author manuscript; available in PMC: 2016 Jul 1.
Published in final edited form as: Occup Environ Med. 2015 Feb 24;72(7):482–488. doi: 10.1136/oemed-2014-102547

Figure 1.

Figure 1

Flow chart of the population showing the different samples included in the analyses (shaded boxes), Nurses' Health Study II.

0R – Operating Room; ER – Emergency Room.

* The question on physician-diagnosed asthma and date of diagnosis was added for the first time in 1991. Asthma history at baseline was defined retrospectively by the report of physician-diagnosed asthma in 1991, with date of diagnosis “before September 1989”.

† Women unemployed in 1989 (excluded) were those who reported being “full-time homemaker”. They reported slightly less often asthma at baseline than employed women (4.9% vs. 5.4%, adjusted p=0.07).

‡ Women who returned at least one questionnaire and provided data on job type over the studied period.