8. Vestergaard 2006: fracture and oral contraceptive use.

Age group (years)	Daily OC dosea	Cases (N)	Controls (N)	ORb (95% CI)
< 25	‐	16,219	48,659	‐‐‐
	< 0.3	331	795	0.97 (0.91 to 1.03)
	0.3 to 0.99	1445	3872	0.96 (0.92 to 1.01)
	> 1	1156	3546	0.92 (0.86 to 0.98)
25 to 49	‐	10,545	31,631	‐
	< 0.3	1895	5491	0.91 (0.82 to 1.00)
	0.3 to 0.99	2444	7445	0.90 (0.77 to 1.05)
	> 1	783	2546	0.87 (0.64 to 1.18)
>50	‐	37,784	113,351	‐
	< 0.3	799	2820	0.92 (0.77 to 1.10)
	0.3 to 0.99	253	977	0.69 (0.45 to 1.05)
	> 1	6	266	0.62 (0.27 to 1.41)

^aExposure as average daily dose, i.e., redeemed prescriptions/time interval from first prescription to fracture or censoring (Characteristics of included studies); < 1 indicates < regular use; > 1 suggests lost prescription and obtained new one.
 ^bAdjusted for Charlson index (19 comorbid conditions), ever use of corticosteroids, alcoholism, working or not, number of bed days in 1999, contacts with physician in 1999, income, living with someone or living alone, prior fracture, education level, pregnancy; use of anti‐epileptic drugs, thyroid active drugs (levothyroxine or antithyroid drugs), or hormone replacement therapy.