Table 1. Results of the Bootstrap-based Model Selection

The analysis was performed on 1,000 data sets created by the bootstrap method and based on 22 original studies. The values are the number of times that that specific model was chosen by Akaike's Information Criterion. The corresponding model was used in the analysis of the original data set.

* Total number of times that a nonlinear model (models 2–5 + 7–10 + 12–15) was chosen.

† Total number of times that a nonadditive interaction model (models 6–15) was chosen.

‡ indicates the most frequently chosen numbers.

MAP = mean arterial pressure; Petco²= end-tidal pressure of carbon dioxide; S = slope of the hypercapnic ventilatory response; V̇⁵⁵= ventilation at a fixed Petco²of 55 mmHg; V̇ⁱ= inspired minute ventilation obtained without any inspired carbon dioxide.