| HIV seronegative controls | HIV seropositive | p value | |
---|---|---|---|---|
Group 1 (3TC, TDF, EFV) | Group 2 (3TC + AZT; 3TC + TDF + LPV/r) | |||
Number | 35 | 44 | 42 | Â |
Time-domain analysis | Â | Â | Â | Â |
 Mean RRi (%) |  + 2.93 (4.51) |  + 4.25 (4.11) |  + 2.71 (4.61) | NS (0.077) |
 STD RR (%) |  − 8.58 (25.35) |  − 6.65 (33.69) |  − 10.58 (22.62) | NS (0.756) |
 pNN50 (%) |  + 31.24 (128.14) |  + 8.85 (97.93) |  + 1.87 (113.44) | NS (0.163) |
 RMSSD (%) |  + 28.85 (28.73) |  + 8.76 (27.16)* |  + 2.26 (38.71)* |  < 0.001 |
 Frequency-domain analysis |  |  |  |  |
 LF freq. (%) | 0.00 (20.14) |  + 7.50 (9.80) | 0.00 (0.14) | NS (0.648) |
 LF power (%) |  − 7.38 (73.34) |  − 23.17 (70.54) |  − 28.26 (55.55) | NS (0.265) |
 LF (n.u.) (%) |  − 17.47 (30.39) |  − 15.80 (27.84) |  − 16.65 (25.90) | NS (0.630) |
 HF freq. (%) |  − 2.86 (15.29) |  + 0.77 (73.13) | 0.00 (42.36) | NS (0.274) |
 HF power (%) |  + 16.43 (64.17) |  + 26.29 (76.26) |  + 12.23 (89.63) | NS (0.366) |
 HF (n.u.) (%) |  + 3.78 (78.35) |  + 22.22 (58.89) |  + 26.76 (63.57) | NS (0.268) |
 LF/HF ratio (%) |  − 28.57 (82.73) |  − 32.31 (45.82) |  − 40.83 (50.10) | NS (0.792) |
Non-linear analysis | Â | Â | Â | Â |
 Poincaré Plot |  |  |  |  |
  SD1 (%) |  − 1.67 (19.33) |  + 8.88 (27.90) |  + 2.08 (38.00) | NS (0.159) |
  SD2 (%) |  − 11.54 (25.98) |  − 9.63 (40.32) |  − 14.36 (23.50) | NS (0.592) |
 Recurrence plot |  |  |  |  |
  Mean line length (%) |  − 15.67 (59.71) |  − 23.37 (36.47) |  − 9.64 (30.21) | NS (0.060) |
  Max line length (%) |  − 29.92 (63.68) |  − 53.41 (28.09) |  − 42.76 (55.93) | NS (0.054) |
  Recurrence rate (%) |  − 7.59 (41.91) |  − 19.02 (26.01) |  − 6.11 (23.10) | NS (0.107) |
  Determinism rate (%) |  − 0.83 (1.19) |  − 0.91 (1.43) |  − 0.33 (0.91) | NS (0.077) |
 Detrended fluctuation analysis |  |  |  |  |
  α1 (%) |  − 6.94 (16.69) |  − 14.04 (24.51) |  − 11.77 (21.84) | NS (0.085) |
  α2 (%) |  + 4.51 (37.56) |  + 4.45 (23.96) |  + 2.50 (29.34) | NS (0.952) |
 Complexity |  |  |  |  |
  Approximate entropy (%) |  − 5.23 (19.44) |  − 11.68 (21.66) |  − 11.88 (12.78) | NS (0.194) |
  Sample entropy (%) |  + 6.25 (29.68) |  + 11.97 (40.57) |  + 11.31 (26.59) | NS (0.779) |
  Correlation dimension (%) |  − 13.76 (43.78) |  − 4.13 (84.48) |  − 12.03 (50.13) | NS (0.849) |