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Table 2 Interobserver Agreement for Determination of Ventilatory Anaerobic Threshold (VO2@AT)

From: Interobserver variability of ventilatory anaerobic threshold in asymptomatic volunteers

  n Mean VO2@AT (±SD), mL/min Mean difference (±SDd), mL/min 95% LOA,a mL/min TEb Mean difference (± SDd), % 95% LOA,a % ICC (95% CI) CVTE, c %
Before consensus discussion
 Reader 1 vs reader 2 (phase 1) 522 1,093 (±279) 0 (±127) ±250 90 0 (±11) ±21 0.901 (0.884–0.916) 8.2
After consensus discussion
 Reader 1 vs reader 2 (phase 1) 522 1,085 (±283) 3 (±46) ±90 32 0 (±4) ±8 0.987 (0.985–0.989) 3.0
 Reader 1 vs reader 2 (phase 1 + 2) 1,056 1,048 (±246) 5 (±82) ±161 58 0 (±8) ±15 0.952 (0.946–0.957) 5.6
 Reader 1 vs trained assistants 794 1,073 (±292) −36 (±213) ±418 151 −2 (±18) ±34 0.759(0.728–0.787) 14.0
 Reader 2 vs trained assistants 793 1,070 (±289) −42 (±208) ±408 147 −3 (±18) ±34 0.762 (0.731–0.790) 13.8
 Reader 1 vs computer analysis 655 1,215 (±371) −313 (±409) ±801 289 −22 (±26) ±51 0.350 (0.281–0.415) 23.8
 Reader 2 vs computer analysis 658 1,210 (±367) −321 (±411) ±806 291 −22 (±26) ±51 0.330 (0.260–0.396) 24.0
 Trained assistants vs computer analysis 654 1,236 (±407) −275 (±367) ±719 259 −19 (±24) ±48 0.519 (0.461–0.573) 21.0
  1. a 95% LOA = ±1.96 × SDd
  2. b TE = SDd / √2
  3. c CVTE = TE / mean VO2@AT × 100
  4. CI Confidence interval, CVTE Coefficient of variation of the TE, d Differences, ICC Intraclass correlation coefficient, LOA Limits of agreement, SD Standard deviation, TE Typical error, VO2@AT Oxygen uptake at the aerobic-anaerobic threshold [mL/min]