Fig. 3From: Suppression of salivary melatonin secretion under 100-Hz flickering and non-flickering blue lightTemporal changes in the rate of melatonin suppression under non-flickering (gray bar) and 100-Hz flickering blue light (white bar). Data are shown as mean + S.D. A number of the subject was eleven. Single plus (+) means statistical tendency (p < 0.1) between non-flickering and 100 Hz-flickering light condition by a repeated measures t testBack to article page