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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Psychol Aging. 2010 Mar;25(1):60–73. doi: 10.1037/a0018748

Table 2. Data Collection Dates, Mean Ages (Standard Deviations) and Age Range for Five Cognitive Measurement Occasions.

Cognitive Measurement Occasion
IPT1
(1986 – 1988)		 IPT2
(1989 – 1991)		 IPT3
(1992 – 1994)		 IPT5
(1999 – 2001)		 IPT6
(2002 – 2004)
N
 Males 232 239 232 208 176
 Females 364 328 325 323 259
Mean
 Males 65.50 (6.78) 65.39 (8.14) 67.10 (8.33) 69.01 (9.20) 71.15 (8.83)
 Females 66.61 (7.87) 67.05 (8.71) 69.87 (9.31) 71.59 (10.26) 73.01 (9.41)
Range
 Males 51-86 50-89 51-85 51-88 54-91
 Females 50-88 50-91 50-94 51-96 54-95

Note: Data represents participants with a baseline openness measurement.