Fig. 1

Cumulative incidence of the outcomes according to the tertile of baseline Hb by IFTA status. (a) Cumulative incidence of renal composite events stratified by baseline Hb in mild IFTA. Black line, the highest tertile of Hb and mild IFTA group (n = 41), orange line, the middle tertile of Hb and mild IFTA group (n = 26), red line, the lowest tertile of Hb and mild IFTA group (n = 15). *p < 0.05 vs. the highest tertile of Hb. (b) Cumulative incidence of renal composite events stratified by baseline Hb in severe IFTA. Black line, the highest tertile of Hb and severe IFTA group (n = 38), orange line, the middle tertile of Hb and severe IFTA group (n = 52), red line, the lowest tertile of Hb and severe IFTA group (n = 61). **p < 0.01 vs. the highest tertile of Hb, and ††p < 0.01 vs. the middle tertile of Hb. (c) Cumulative incidence of all-cause mortality stratified by baseline Hb in mild IFTA. Black line, the highest tertile of Hb and mild IFTA group (n = 41), orange line, the middle tertile of Hb and mild IFTA group (n = 26), red line, the lowest tertile of Hb and mild IFTA group (n = 15). (d) Cumulative incidene of all-cause mortality stratified baseline Hb in severe IFTA. Black line, the highest tertile of Hb and severe IFTA group (n = 38), orange line, the middle tertile of Hb and severe IFTA group (n = 52), red line, the lowest tertile of Hb and severe IFTA group (n = 61). *p < 0.05 vs. the highest tertile of Hb, **p < 0.01 vs. the highest tertile of Hb, and †p < 0.05 vs. the middle tertile of Hb. Abbreviations: Hb, hemoglobin; IFTA, interstitial fibrosis and tubular atrophy