Results of low heart rate variability on time Time domain preop (1) (n=119) 7 days postop (2) (n=110) 3 months postop (3) (n=102) 6 months postop (4) (n=102) HRV (n,%) low 34 (28, 60) 57 (51, 80) 20 (19, 60) 13 (12, 70) Normal 85 (71, 40) 53 (48, 20) 82 (80, 40) 89 (87, 30) p p (1, 2) < 0, 001 p (1, 3) > 0, 05 p (1, 4) < 0, 05 Table 3.18.