Age <13 years | (N=53) | Age 13–14 years | (N=47) | Age 15–16 years | (N=47) | Age >16 years | (N=41) | Total | (N=188) | ||
---|---|---|---|---|---|---|---|---|---|---|---|
Median (SD) | Range | Median (SD) | Range | Median (SD) | Range | Median (SD) | Range | Median (SD) | Range | Percentile (2nd–98th) | |
Heart rate, bpm | 76 (11) | 50–94 | 69 (14) | 46–109 | 65 (12) | 45–111 | 59 (11) | 43–88 | 67 (13) | 43–111 | 47–94 |
QRS axis*, degree | 73 (24) | −23–106 | 78 (21) | 1–137 | 79 (23) | 8–110 | 76 (26) | −20–109 | 77 (24) | −23–137 | 0–109 |
PR time, ms | 145 (20) | 115–222 | 138 (20) | 108–210 | 146 (20) | 118–215 | 161 (21) | 110–215 | 147 (22) | 108–222 | 114–212 |
QRS time, ms | 80 (9) | 68–110 | 87 (9) | 69–107 | 89 (10) | 70–117 | 91 (11) | 74–112 | 87 (11) | 68–117 | 71–111 |
QTc time, ms | 420 (22) | 353–461 | 421 (23) | 372–468 | 412 (25) | 358–466 | 407 (21) | 365–448 | 415 (23) | 353–468 | 365–460 |
R in V1†, mm | 3 (2) | 0–11 | 3 (3) | 1–14 | 3 (2) | 0–10 | 2 (2) | 0–8 | 3 (2) | 0–14 | 0–10 |
S in V1†, mm | 10 (4) | 1–21 | 9 (5) | 0–21 | 10 (6) | 3–38 | 7 (4) | 2–19 | 9 (5) | 0–38 | 3–21 |
S in V2, mm | 22 (7) | 7–37 | 23 (9) | 4–45 | 21 (8) | 9–48 | 21 (7) | 4–35 | 22 (8) | 4–48 | 8–40 |
S in V5, mm | 3 (1) | 0–6 | 2 (2) | 0–6 | 2 (2) | 0–11 | 3 (2) | 0–6 | 2 (2) | 0–11 | 0–6 |
R in V5/V6‡, mm | 17 (5) | 7–37 | 17 (6) | 8–42 | 19 (5) | 8–29 | 18 (4) | 9–27 | 18 (5) | 7–42 | 9–30 |
R or S in standard lead§, mm | 14 (4) | 6–23 | 14 (5) | 7–26 | 15 (5) | 6–26 | 12 (4) | 6–24 | 14 (4) | 6–26 | 7–24 |
*N=184 due to undetermined axis in 4 ECGs.
†N=187 due to missing V1 in 1 ECG.
‡Biggest R was used.
§Biggest R or S was used.