Table 4 Mixed regression models predicting absolute prediction error (repetitions completed—centered)

Variable

Estimate [95% CI],

p value

Estimate [95% CI],

p value

Intercept

4.53 [3.57, 5.46]

 < 0.001

4.52 [3.67, 5.38]

 < 0.001

66% versus 33% failure proximity

 − 1.60 [− 1.82, − 1.38]

 < 0.001

 − 1.49 [− 1.75, − 1.22]

 < 0.001

90% versus 33% failure proximity

 − 2.07 [− 2.36, − 1.78]

 < 0.001

 − 2.05 [− 2.40, − 1.69]

 < 0.001

Set 2 versus set 1

 − 1.21 [− 1.36, − 1.07]

 < 0.001

 − 1.20 [− 1.38, − 1.02]

 < 0.001

Squat versus biceps-curls

2.23 [1.96, 2.50]

 < 0.001

1.43 [1.13, 1.74]

 < 0.001

80% versus 70%1RM

 − 1.10 [− 2.22, 0.013]

0.052

 − 1.17 [− 2.16, − 0.19]

0.022

Repetitions completed (centered)

 − 0.11 [− 0.14, − 0.08]

 < 0.001

 − 0.07 [− 0.11, − 0.04]

 < 0.001

Years of training experience (centered)

–

 − 0.020 [− 0.039, − 0.0007]

0.042

Male versus female trainee

 − 0.59 [− 1.70, 0.51]

0.266

 − 0.47 [− 1.46, 0.52]

0.324

Male versus female coach

–

0.03 [− 0.23, 0.30]

0.810

Male versus female coach X male versus female trainee

–

0.03 [− 0.35, 0.43]

0.843

Squat versus biceps-curls X 80% versus 70%1RM

 − 1.37 [− 1.67, − 1.06]

 < 0.001

 − 0.80 [− 1.15, − 0.45]

 < 0.001