Table 4.

6MWD among SARS survivors (n = 48) ^† at 24 months after illness onset in comparisons with Hong Kong normative data ^‡

	Normal Mean (SD), meters	24‐month mean (SD), meters	Mean difference, meters	95% CI	P value
Age group 21 to 30 years (n = 9)
Males	651 (105); [n = 80]	542 (76); [n = 3]	−109	−231.1 to 13.1	0.080
Females	600 (84); [n = 85]	496 (105); [n = 6]	−104	−175.6 to −32.4	0.005*
Age group 31 to 40 years (n = 13)
Males	645 (93); [n = 78]	510 (109); [n = 6]	−135	−214.3 to −55.7	0.001*
Females	606 (86); [n = 108]	516 (70); [n = 7]	−90	−155.9 to −24.1	0.008*
Age group 41 to 50 years (n = 16)
Males	623 (80); [n = 38]	550 (139); [n = 3]	−73	−174.9 to 28.9	0.155
Females	541 (67); [n = 79]	459 (104); [n = 13]	−82	−125.4 to −38.6	<0.001*
Age group 51 to 60 years (n = 10)
Males	588 (68); [n = 23]	375 (19); [n = 3]	−213	−4.303 to −290	0.007*
Females	534 (89); [n = 33]	373 (174); [n = 7]	−161	2.447 to −326	0.055

^* Of statistical significance.

^† Four males and three females aged 61 years or above were not included as no normative data were available.

^‡ The normative reference data were collected from a population survey of 538 normal healthy subjects in 2004 by the Coordinating Committee in Physiotherapy, HK Hospital Authority, on two separate days.

SARS, severe acute respiratory syndrome.