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Fig. 2 | BMC Public Health

Fig. 2

From: C-reactive protein mediates the association between leisure-time physical activity and lung function in middle-aged and older adults

Fig. 2

Results of mediation analysis for PA, CRP and FVC. A for moderate PA; B for high PA. CRP: C-reactive protein; FVC: forced vital capacity; PA: physical activity; β: regression coefficient. X: independent variable (cause); Y: dependent variable (outcome); M: mediator. Path a: X is related to M; Path b: M is related to Y after adjusting for X; Path c: X is related to Y; Path c’: X is related to Y when M is included in the models as a covariate. Models were adjusted for age, sex, education level, cigarette smoking, alcohol drinking, body mass index, cardiovascular diseases (angina, congestive heart failure and stroke), chronic lung diseases, cancer and dementia.

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