Table 3.

Presence of Parent Drug & Appliances Read Codes for the AS Patients

Parent Read Code	Disease Group	Retrospective				Prospective
		10 year (n = 183)	5 year (n = 164)	1 year (n = 147)	3 months (n = 120)	3 months (n = 103)
a	Gastro-intestinal system drugs	123	103	75	47	42
b	Cardiovascular system drugs	69	65	50	39	36
c	Respiratory system drugs	74	56	30	18	20
d	Central nervous system drugs	147	125	83	52	40
e	Drugs for infectious diseases	139	114	59	20	18
f	Endocrine drugs	63	56	29	19	13
g	Obs/gynae/urinary drugs	42	33	22	8	6
h	Malignant & immunosuppr. drug	19	13	9	8	8
i	Haematology/dietetic drugs	54	44	29	18	17
j	Musculoskeletal & joint drugs	157	134	89	59	52
k	Eye drugs	61	48	26	11	9
l	Ear, nose & oropharynx drugs	61	48	16	7	6
m	Skin drugs	105	90	46	23	17
n	Immunology drugs & vaccines	48	38	15	3	0
o	Anaesthetics	10	7	1	0	0
p	Appliances & reagents etc.	41	37	14	8	8
q	Incontinence Appliances	2	2	2	1	1
s	Contrast media	8	8	5	3	2

Note: Baseline questionnaire completion is the reference date. The last column applies to the patients whose data in the GP system exist at least 3 months post questionnaire completion date