Here is a medical article: "The value of the difference | PGA - PhGA | defining discordance varied between ≥0.5 cm (n = 2 studies) to ≥3 cm (n = 5 studies); the weighted mean value was 2.7 cm. The pooled percentage of patients with discordance was 43% (95% confidence interval 36%-51%; range 25%-76%). PGA was usually higher than PhGA. The drivers of PGA were pain and functional incapacity, whereas drivers of PhGA were joint counts and acute-phase reactants."
Recognize all medical terms and abbreviations of type biologic function from the medical article above and list them as a comma-separated list.
A biologic function is defined as a state, activity or process of the body or one of its systems or parts. Do not say the word "incapacity" in the response
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