Table 1

Mean and range of pupil sizes for twin pairs after exclusions

EyeMZ twin pairsDZ twin pairs
NMean (SD)RangeICCNMean (SD)RangeICC
Right2137.79 (0.73)4.7–9.50.822707.79 (0.69)5.2–9.50.39
Left2167.82 (0.70)4.6–9.50.822687.81 (0.70)4.2–9.50.39
  • MZ = monozygotic, DZ = dizygotic; N = number of twin pairs; ICC = intraclass correlation coefficient within twin pairs.