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Table 3.

Intraclass correlations for percent change in the first 5 min, heart rate acceleration (0-30 min) and deceleration (30-60 min) in MZ and DZ twin pairs following nicotine infusion

HR phenotypeMZ n = 110 pairs
DZ n = 29 pairs
MeanSDrMeanSDr
Percent change (0-5 min) 7.36 10.88 0.31* 8.95 10.50 −0.14 
Acceleration (0-30 min) 0.20 0.43 0.33* 0.18 0.48 0.09 
Deceleration (30-60 min) −0.23 0.45 0.22* −0.32 0.31 −0.13 
HR phenotypeMZ n = 110 pairs
DZ n = 29 pairs
MeanSDrMeanSDr
Percent change (0-5 min) 7.36 10.88 0.31* 8.95 10.50 −0.14 
Acceleration (0-30 min) 0.20 0.43 0.33* 0.18 0.48 0.09 
Deceleration (30-60 min) −0.23 0.45 0.22* −0.32 0.31 −0.13 

NOTE: *, P < 0.01.

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