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Figure 1 | BMC Medicine

Figure 1

From: Systematic review of the evidence relating FEV1decline to giving up smoking

Figure 1

Flow diagram for literature search. The diagram shows the number of papers and studies identified, examined, accepted and rejected at the different stages of the literature search. Reasons for rejection of papers are coded as follows. R1, paper unobtainable; R2, study of patients with specified conditions that are not chronic obstructive pulmonary disease; R3, study of workers in high-risk occupations; R4, study of children; R5, review paper with no new studies mentioned; R6, not a prospective study; R7, follow-up period too short (< 2 yr); R8, no follow-up data; R9, data only for FEV0.75; R10, no relevant data on FEV1 decline in those who gave up smoking. Fuller details are given in Additional file 1 FEV1 search strategy.doc.

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