Table 2.

Proportionate improvements in ISDs for older groups.

	Reduction in young-old ISD differences at Block 4 relative to Block 1 (%)	Within-group ISD reduction by Block 4 (%)
OFH	50.00	34.12
OFL	36.11	28.57
OCH	39.23	31.19
OCL	9.32	13.59

OFH, older, feedback, higher education; OFL, older, feedback, lower education; OCH, older, control, higher education; OCL, older, control, lower education. The first column of values indicates the within-group percentage improvement at Block 4 relative to Block 1. The second column of values indicates a “difference of differences”; we subtracted the difference between Young-Old group ISDs at Block 4 from the Young-Old group ISD difference at Block 1, and the percentage reduction at Block 4 is noted here.