Table 1. Descriptive statistics of cohort- age, social class, Charlson's index and co-prescribing.

	Patients with tamoxifen (%)	No tamoxifen (%)	Wald χ2 test (Wald, d.f., P)
Numbers	1633 (79)	447 (21)
Age group
<40	84 (5)	37 (8)	22.6, 5, P<0.001
40–49	237 (15)	94 (21)
50–59	435 (27)	112 (25)
60–69	365 (22)	95 (21)
70–79	331 (20)	77 (17)
80+	181 (11)	32 (7)
Carstairs category
1	152 (9)	29 (7)	14.9, 5, P=0.011
2	327 (20)	108 (24)
3	443 (27)	145 (32)
4	306 (19)	66 (15)
5	164 (10)	34 (8)
6/7	237 (15)	64 (14)
Number of prescriptions at diagnosis
0	500 (31)	254 (57)	104.9, 3, P<0.001
1–2	457 (28)	77 (17)
3–5	397 (24)	63 (14)
6+	279 (17)	53 (12)
Charlson's index
0–2	476 (29)	198 (44)	37.9, 2, P<0.001
3–5	510 (31)	100 (22)
6+	647 (40)	149 (33)