Table 4.

Validation of the extrapolated estimates of life expectancy after diagnosis of RA based on 7 years of follow‐up of the RA cohort compared with 14 years of actual follow‐up, calculated by the Kaplan‐Meier method^*

Sex and age at diagnosis	Age at diagnosis, mean ± SD years	Censoring rate at end of 7th year, %	Estimate using the extrapolation based on the first 7 years to the 14th year, months	Actual follow‐up of 14 years by Kaplan‐Meier estimate, months	Relative bias, %†
All
Men (n = 3,824)	55.33 ± 14.14	92.5	143.40 ± 2.96	140.32 ± 0.80	2.2
Women (n = 12,718)	51.97 ± 13.86	96.8	155.97 ± 7.79	154.06 ± 0.37	1.2
Ages 16–49 years
Men (n = 1,350)	40.27 ± 7.62	98.3	155.19 ± 14.29	159.83 ± 0.65	–2.9
Women (n = 5,599)	39.59 ± 7.94	99.2	164.02 ± 5.54	164.20 ± 0.24	–0.1
Ages 50–65 years
Men (n = 1,459)	57.02 ± 4.27	95.1	150.76 ± 5.86	146.32 ± 1.19	3.0
Women (n = 4,800)	56.53 ± 4.24	98.1	152.33 ± 9.41	157.69 ± 0.46	–3.4
Ages >65 years
Men (n = 1,015)	72.94 ± 5.75	81.2	104.42 ± 6.95	104.94 ± 1.89	–0.5
Women (n = 2,319)	72.43 ± 5.67	88.3	127.33 ± 8.13	121.62 ± 1.30	4.7

^*Only data for rheumatoid arthritis (RA) cases diagnosed between 2003 and 2009 were included in the extrapolation. Except where indicated otherwise, values are the mean ± SEM.

^†Relative bias = (extrapolated estimate – Kaplan‐Meier estimate)/Kaplan‐Meier estimate.