Table 4.

Six-minute walking distance among coronavirus disease 2019 survivors (n=85) at 3 and 6 months after the onset of illness compared with normative data

Outcome	Normal	After 3 months	After 6 months	P
All survivors (n=85), mean±SD		486±72	526±82	0.001*
Age groups (years)
20-30 (n=25)
Men (n=12)
Mean±SD	652±102	478±68	559±83	0.001*
Mean difference (95% CI)		−174 (−198-−126)	−93 (−120-−55)**
Women (n=13)
Mean±SD	600±80	462±71	490±86	0.001*
Mean difference (95% CI)		−138 (−170-−80)	−110 (−140-−60)**
31-40 (n=35)
Men (n=20)
Mean±SD	650±90	512±78	550±88	0.001*
Mean difference (95% CI)		−138 (−188-−90)	−100 (−140-−60)**
Women (n=15)
Mean±SD	615±85	470±66	492±80	0.001*
Mean difference (95% CI)		−145 (−195-−95)	−123 (−152-−80)**
41-50 (n=16)
Men (n=10)
Mean±SD	620±70	470±65	530±73	0.001*
Mean difference (95% CI)		−150 (−192-−87)	−90 (−142-−43)**
Women (n=6)
Mean (SD)	520±60	402±72	462±78	0.001*
Mean difference (95% CI)		−118 (−155-−64)	−58 (−112-−30)**
>50 (n=9)
Men (n=6)
Mean±SD	580±64	410±82	464±82	0.001*
Mean difference (95% CI)		−170 (−210-−90)	−116 (− 165-−85)
Women (n=3)
Mean±SD	535±72	399±94	377±88	0.001*
Mean difference (95% CI)		−136 (−180-−96)	−158 (−210-−90)**

*= significance. SD=Standard deviation, CI=Confidence interval