Table 2.

Hip fractures in men.

	65–69		70–74		75–79		80–84		85–89		90–95
Nat risk	104,168		90,068		69,476		42,820		21,388		6,785
Person years	787,422		638,587		507,435		337,369		175,148		144,333
	Nfra	Rate	Nfra	Rate	Nfra	Rate	Nfra	Rate	Nfra	Rate	Nfra	Rate
Jan	94	1.1	162	2.4	236	4.3	311	8.6	262	13.9	587	27.6
Feb	126	1.5	190	2.8	284	5.4	364	10.5	361	20.0	607	30.9
Mar	125	1.3	168	2.2	267	4.5	366	9.3	319	15.8	641	30.0
Q1	345	1.3	520	2.5	787	4.7	1041	9.5	942	16.6	1835	29.5
Apr	116	1.3	166	2.4	292	5.2	357	9.9	303	16.6	649	33.0
May	110	1.2	192	2.7	259	4.6	330	9.1	277	15.2	656	32.4
Jun	128	1.6	171	2.6	249	4.7	334	10.1	344	19.8	619	29.1
Q2	354	1.4	529	2.5	800	4.9	1021	9.7	924	17.2	1924	31.5
Jul	110	1.4	156	2.4	240	4.6	306	9.0	351	19.9	620	36.8
Aug	126	1.6	140	2.1	245	4.8	314	9.2	334	18.7	660	31.4
Sep	106	1.4	161	2.5	250	4.9	319	9.3	329	17.7	653	30.3
Q3	342	1.4	457	2.3	735	4.8	939	9.2	1014	18.8	1933	32.8
Oct	119	1.6	155	2.6	211	4.4	340	10.4	291	16.3	710	28.0
Nov	98	1.4	169	3.0	240	5.2	330	10.5	301	17.9	638	36.4
Dec	99	1.3	152	2.5	250	5.2	320	9.7	329	17.8	692	34.1
Q4	316	1.4	476	2.7	701	4.9	990	10.2	921	17.3	2040	32.8
	p = 0.30		p = 0.05		p = 0.23		p = 0.065		p = 0.02		p = 0.001

Men. Hip fractures in Danish men 1997–2005 as a function of age and season of birth. Fracture rates are in fractures per 1000 person years, adjusted for the influence attributable to age difference between subjects born in different quarters of the same year. p-Values are for χ² tests comparing fracture risk for the four quarters of the year. Number of subjects per age group is per January 1, 1997 as size of population at risk varies by outcome year.