Table 1.

Sample Characteristics by Wave

Characteristic	Wave 1	Wave 2	Wave 3	Wave 4	Wave 5
N	1,091	866	697	550	431
Sex
Men	548	448	360	275	209
Women	543	418	337	275	222
Mean age in years (SD)	69.58 (0.83)	72.54 (0.71)	76.30 (0.68)	79.38 (0.62)	82.06 (0.47)
Mean father’s social class (SD)	2.91 (0.94)	2.92 (0.94)	2.89 (0.94)	2.88 (0.95)	2.86 (0.95)
Mean father’s education years (SD)	9.96 (2.24)	9.98 (2.27)	9.96 (2.28)	10 (2.35)	10.09 (2.36)
Mean social class (SD)	2.4 (0.91)	2.36 (0.92)	2.33 (0.93)	2.26 (0.92)	2.23 (0.91)
Mean years of education (SD)	10.74 (1.13)	10.79 (1.14)	10.8 (1.14)	10.87 (1.18)	10.9 (1.17)