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Subjective and objective sleep quality in the r24 and I<O subgroups. The trends of changes in (A) the PSQI and (B) TST in the poor r24 subgroup and in (C) the PSQI and (D) TST in the poor I<O subgroup. I<O, in-bed less than out-of-bed dichotomy index; PSQI, Pittsburgh Sleep Quality Index; r24, 24-h autocorrelation coefficient; TST, total sleep time.
