Table 2. Clinical features comparing severe AS and normal AS.

Sex		severe AS (82)	normal AS (314)	p value
	male	76(92.7%)	276(87.9%)	0.220
	female	6(7.3%)	38(12.1%)
Age		31.5±9.2	29.0±8.3	0.097
Duration of diagnosis		11.2±3.0	11.6±1.8	0.290
BASFI		6.03±2.06	3.43±0.55	<0.001
BASDAI		5.49±1.10	3.55±0.55	<0.001
mSASSS		37.1±13.3	6.21±1.06	<0.001

There is no difference between severe AS patients and normal patients in age and sex distribution; however, the BASFI, BASDAI and mSASSS are higher in severe AS patients.