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Kernel density plots of personal CO and exhaled breath CO at baseline and follow-up in the early stove and delayed stove groups. A, Personal CO, early stove group. B, EBCO in RESPIRE, early stove group. C, EBCO in CRECER, early stove group. D, Personal CO, delayed stove group. E, EBCO in RESPIRE, delayed stove group. F, EBCO in CRECER, delayed stove group. CO = carbon monoxide; EBCO = exhaled breath carbon monoxide. See Figure 1 legend for expansion of other abbreviations.
