Table 1.
Heart rate variability results of rural and city school students.
| Variables | RSG | CSG | T | p-Value | 95% Confidence | Cohen’s D | |
|---|---|---|---|---|---|---|---|
| n = 75 | n = 106 | Lower | Upper | ||||
| HRmean | 105.37 ± 61.91 | 98.74 ± 13.15 | 0.976 | 0.331 | −6.79 | 20.05 | −0.11 |
| RMSSD | 67.00 ± 25.59 | 61.25 ± 36.02 | 1.091 | 0.277 | −4.66 | 16.15 | −0.22 |
| pNN50 | 30.33 ± 15.52 | 23.27 ± 15.44 | 2.777 | 0.006 | 2.03 | 12.08 | −0.45 |
| LF | 67.99 ± 16.78 | 64.12 ± 16.48 | 1.426 | 0.156 | −1.50 | 9.33 | −0.23 |
| HF | 30.87 ± 16.27 | 35.71 ± 16.38 | −1.808 | 0.073 | −10.21 | 0.45 | 0.30 |
| LF_HF | 4.23 ± 5.42 | 2.60 ± 2.40 | 1.413 | 0.160 | −3.60 | 14.70 | −0.15 |
| SD1 | 47.43 ± 18.12 | 43.36 ± 25.50 | 1.092 | 0.277 | −2.92 | 11.06 | −0.22 |
| SD2 | 121.91 ± 70.66 | 112.46 ± 57.34 | 0.910 | 0.365 | −11.81 | 30.72 | −0.13 |
RSG, rural school group; CSG, city school group; HRmean, heart rate mean; RMSSD, root-mean square differences of successive heartbeat intervals; pNN50, percentage of successive RR-interval pairs differing in more than 50 milliseconds in the entire recording divided by the total number of RR waves intervals; LF: low-frequency band; HF: high-frequency band; LF/HF Ratio; SD1, transverse axis; SD2, longitudinal axis.