Table 5. Risk of breast cancer associated with oral steroid use.

	Cases (n=3708)	Controls (n=20 000)	Odds ratioa (95% CI)
Oral steroid use
No useb	3370	18 090
Current use	132	820	0.83 (0.68, 1.02)
Past use	206	1090	0.99 (0.84, 1.16)
Oral steroid duration
0–0.9 years	93	560	0.84 (0.66, 1.07)
1–1.9 years	9	59	0.88 (0.42, 1.80)
2–3.9 years	17	82	1.09 (0.63, 1.90)
4+ years	13	119	0.66 (0.36, 1.18)
Oral steroid dosec
Low-medium	34	212	0.90 (0.62, 1.32)
High	5	48	0.57 (0.22, 1.47)
Oral steroid indicationc
Respiratory disease	13	70	1.13 (0.61, 2.08)
Osteoarthritis	4	28	0.69 (0.23, 2.09)
Polymyalgia rheumatica	8	57	0.77 (0.36, 1.65)
Rheumatoid arthritis	9	57	0.96 (0.46, 1.99)
Other	5	48	0.53 (0.20, 1.38)

^aEstimates are adjusted for age, calendar year, BMI, alcohol intake, smoking status, HRT, aspirin, NSAID, paracetamol, and prior benign breast disease using logistic regression.

^bReference category.

^cAmong current long-term users (1 or more years of treatment duration) vs nonusers.