The Bath Ankylosing Spondylitis
Global Score (BAS-G)

		TOTAL / 10
	How have you been over the last week? VERY GOOD VERY BAD
	How have you been over the last six months? VERY GOOD VERY BAD
	TOTAL OUT OF 20
	TOTAL / 2 (BAS-G SCORE)

BASFI Score Calculation
Score from all questions are calculated using a ruler and added. This figure is divided by 10to obtain an average. This is the BASFI score. The higher the BASFI score, the more severe the patient’s limitation of function due to their AS.

BASDAI Score Calculation
Score from all questions are calculated using a ruler. The mean measurement (score) of
questions 5 and 6 is added to the scores from questions 1 to 4. This total is then divided by 5 to give the average. This is the BASDAI score. The higher the BASDAI score, the more severe the patients disability due to their AS.

BAS-G Score
Scores from the 2 questions are calculated using a ruler and added. This figure is divided by 2 to obtain an average, this is the BAS-G score. The higher the BAS-G score, the more severe the effect of AS on the patient’s life.

Please Note:
When using visual analog scales of a set length (10cm in the case of the Bath Indices), great care must be taken in reproducing assessment paperwork as repeated photocopying, for example, may distort the length of the lines and therefore will affect the accuracy of the scoring.

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