Table 1.

The Study Cohort, Which is a Subset of the LSADT Consisting of Twin Pairs Who Had Their Faces Swapped in Photographic Images

	All twins	Where One or Both Twins Have Died In
		7 Years of Follow-up	7–12 Years of Follow-up
Number of twin pairs	187	83	57
Number of monozygotic twin pairs (%)	83 (44.4)	31 (37.3)	18 (31.6)
Number of female twin pairs (%)	116 (62.0)	47 (56.6)	38 (66.7)
Average age at time of photograph (SD)	76.0 (4.6)	77.8 (5.3)	75.7 (3.5)
Average perceived age of twins in
Original photographs (SD)	78.8 (4.2)	80.3 (4.3)	78.4 (3.5)
Swapped images (SD)	77.9 (4.5)	79.6 (4.6)	77.9 (3.7)