TABLE 5.

Estimated mixed-effects regression models for number of sighs and respiratory means.

	Number of sighs		Mean of V’E and VT		Mean of TI		Mean of TE
	IRR	95% CI	Coeff.	SE	Coeff.	SE	Coeff.	SE
Main effects
Session	1.24**	1.08–1.43	0.137***	0.035	0.001	0.013	0.004	0.015
Phase	0.98	0.86–1.11	−0.144***	0.033	−0.044***	0.010	−0.014	0.015
MPA	1.00	0.98–1.01	0.022	0.012	0.000	0.002	−0.002	0.003
TA	1.01	1.00–1.03	−0.016	0.013	−0.001	0.002	0.000	0.003
Age	1.01	0.97–1.05	−0.014	0.039	0.006	0.006	0.011	0.009
Gender	0.92	0.65–1.29	0.52	0.30	0.010	0.049	−0.026	0.068
Hormonal contraception	0.76	0.53–1.07	0.59	0.30	−0.011	0.050	−0.026	0.068
BMI	1.05	1.00–1.11	0.076	0.049	0.016*	0.008	0.017	0.011
Instrument group	0.97	0.73–1.29	−0.020	0.251	0.074	0.041	0.005	0.057
Motion	3.06***	1.59–5.90	0.708**	0.229	−0.003	0.055	−0.054	0.063
Interactions
Session × Phase	0.79	0.61–1.02	−0.149*	0.064	−0.097***	0.026	−0.062	0.034
Session × MPA	1.01*	1.00–1.03	−0.005	0.003	−0.000	0.001	0.001	0.001
Phase × MPA	1.00	0.98–1.01	−0.001	0.003	0.002**	0.001	0.003*	0.001
Session × TA	0.99	0.98–1.01	0.006	0.004	0.000	0.001	0.000	0.002
Phase × TA	1.00	0.99–1.02	−0.005	0.003	−0.000	0.001	0.001	0.001

V’_E, minute ventilation; V_T, tidal volume; T_I, inspiratory time; T_E, expiratory time; MPA, music performance anxiety; TA, trait anxiety; BMI, body mass index; Coeff., estimated coefficient; SE, standard error; IRR, incidence-rate ratio; CI, confidence interval. Reference categories for categorical predictors are as follows: session: practice; phase: pre-performance; gender: women; hormonal contraception: naturally cycling women; instrument group: other instrumentalists. For continuous predictors, coefficients express the change in the outcome measure per unit of the corresponding scale. Units are as follows: MPA and TA: 1 point on the corresponding scales; age: 1 year; BMI: 1 kg/m²; motion: 1 point. Statistically significant results are marked in bold. *** p < 0.001, ** p < 0.01, * p < 0.05.