Table 3.

Study Subjects by Number of Follow-ups and Mean Interval Between Assessments

Follow-up	All		New Hip Fracture		Lost to Follow-up After This Assessment
	N	Mean Interval (SD)	N	Mean Interval (SD)
2	40,279	221.7 (151.0)	637	250.0 (187.5)	21,753
3	17,889	194.5 (104.9)	222	197.8 (126.2)	9,834
4	7,883	182.2 (83.6)	85	158.0 (102.3)	4,609
5	3,139	168.4 (72.9)	46	148.8 (111.1)	1,978
6	1,115	153.1 (61.7)	8	110.8 (71.2)	805
7	302	137.8 (58.8)	4	100.5 (40.8)	228
8	70	114.6 (56.8)	1	79.0 (–)	51
9	18	93.2 (61.6)	0	–	14
10	4	121.5 (104.9)	0	–	4