A circadian stage-dependence in Figure 4 is found by Student t-tests that show an aging effect in RBS to be not demonstrable at certain circadian stages, while it is statistically highly significant at other times of day; each result, that around 10:30 vs that at 19:30, is documented with relatively ample data.
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The sentences
Even decade-long records may thus exhibit either an increasing or a decreasing trend depending on when during this about 26-year cycle monitoring took place.