TABLE 2.

Results of the bivariate Cholesky decomposition for VASA scores assessed before and after one vital capacity breath of 35% CO₂ and again before and after one vital capacity breath of regular air

Model parameters	Sex effects (Quan/Qual)	−2LL	DF	AIC	ΔAIC
35% CO2
I. ACE	+/+	1,990.89	1,388	−785.11	—
II. ACE	+/−	1,990.89	1,389	−787.11	—
III. ACE	+/−	1,999.61	1,395	−790.39	—
IV. ACE	−/−	2,002.84	1,396	−789.16	—
Submodels
V. AE*	−/−	2,002.99	1,398	−795.01	−5.85
VI. CE	−/−	2,007.62	1,398	−790.38	−1.22
Regular air
I. ACE	+/+	1,536.39	1,383	−1,229.61	—
II. ACE	+/−	1,540.89	1,384	−1,227.11	—
III. ACE	−/+	1,550.36	1,390	−1,229.64	—
IV. ACE*	−/−	1,551.87	1,391	−1,230.13	—
Submodels
V. AE	−/−	1,553.76	1,394	−1,234.24	−4.11
VI. CE	−/−	1,553.09	1,394	−1,234.91	−4.78

^*Indicates best fitting model.

Qual, qualitative sex effects; Quan, quantitative sex effects; “+” indicates the presence of either qualitative or quantitative sex effects or “−” indicates their absence from the model. The AE and CE models are nested submodels of the ACE model.