Vitacca et al. (A-51) conducted a study to determine whether the supine position or sitting position worsens static, forced expiratory flows and measurements of lung mechanics. Subjects were aged persons living in a nursing home who were clinically stable and without clinical evidence of cardiorespiratory diseases. Among the data collected were the following FEV1 percent values for subjects in sitting and supine postures:

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Sitting Supine Sitting Supine 64 56 103 44 37 109 44 39 -99 -99 40 43 32 32 70 61 82 22 58 74 48 -99 73 169 73 -99 58 94 91 63