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Indices of disordered sleep for A1 index quartiles in MrOS and SOF. The relationship between indices of disordered sleep (OAHI, AI-NREM, and PLMSI) and A1 index quartiles in Osteoporotic Fractures in Men (MrOS) Study and Study of Osteoporotic Fractures (SOF). Significance level (*p < 0.017) was adjusted according to the number of variables under consideration. OAHI, obstructive apnea–hypopnea index; AI-NREM, arousal index; PLMSI, periodic limb movement in sleep index.
