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. 2024 Oct 31;14(10):e075955. doi: 10.1136/bmjopen-2023-075955

Figure 1. Study flow chart. National Health and Nutrition Examination Survey 2007–2012. CKD, chronic kidney disease; eGFR, estimated glomerular filtration rate (mL/min per 1.73 m2); FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; PRISm, preserved ratio impaired spirometry; UACR, urinary albumin to creatinine ratio; VO, variable obstruction.

Figure 1