Figure 1. Short physical performance battery diagram showing the subscores for three tests—standing balance, gait speed, and sit-and-stand—of both groups on Days 1 and 7.

Each test score varies from 0 to 4, and the short physical performance battery summary score varies from 0 to 12. Scores between 0 and 3 denote severe physical function impairment, scores between 4 and 6 indicate low function, scores between 7 and 9 indicate intermediate function, and scores between 10 and 12 indicate normal function. The Invasive Mechanical Ventilation Group scores are presented in gray, and the Non-Invasive Mechanical Ventilation Group scores are presented in blue. The Day 1 scores are shown as continuous lines, and the Day 7 scores are shown as dashed lines. The data are presented as the mean ± standard deviation.

IMV - invasive mechanical ventilation; SPPB - short physical performance battery; D1 - Day 1; D7 - Day 7.