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Table 3 Variables according to age groups (BS = before syncope, BP = blood pressure, AS = after syncope)

From: PR interval as a predictor of syncope in tilt-up testing in adolescents and young adults

Variable Age groups (years) TOTAL p
12-15
n = 53
16-18
n = 54
19–30
n = 35
12-30
n = 142
ANOVA
Female (%) 37 (69.81%) 40 (74.07%) 26 (74.28%) 103 (72.53%)  
PR interval (ms) 142.8 ± 3.2 147.7 ± 2,7 149.4 ± 3.6 146.3 ± 1.8 0.183
PR interval BS (ms) 103.2 ± 2.1 109.1 ± 2.5 112.6 ± 2.5 107.7 ± 1.7 0.046
PR shortening (%) 27.6 ± 1.4 25.8 ± 2.3 24.4 ± 1.7 26.1 ± 0.8 0.155
PR interval AS (ms) 132.6 ± 1.8 135.4 ± 2.1 140.0 ± 2.2 135.5 ± 2.0 0.185
QT interval (ms) 360.6 ± 3.9 362.9 ± 3.5 368.8 ± 3.1 363.5 ± 2.1 0.136
BMI (kg/m2) 21.8 ± 1.2 21.2 ± 0.9 22.5 ± 1.1 21.8 ± 0.6 NS
HR preparation (bpm) 78.5 ± 1.9 73.4 ± 1.5 71.8 ± 1.9 74.9 ± 1.1 0.023
HR orthostatic (bpm) 105 ± 2.2 96.8 ± 1.9 91 ± 2.2 98.7 ± 1.3 0.00003
HR change (bpm) 26.9 ± 1.7 23.4 ± 1.6 19.4 ± 2.2 23.7 ± 1.1 0.008
Time of syncope (min) 20.8 ± 1.5 20.5 ± 1.5 16.1 ± 1.6 19.6 ± 0.9 0.037