GSTM1 and obstructive sleep apnea syndrome: Further, inter‐group comparisons showed that the Oxy‐Hb change of Channel 25 (located in the dorsalateral prefrontal lobe) in OSA without depressive symptoms group was less than that in HCs group (p = .006), and the Oxy‐Hb change of Channel 43 (located in the right frontal pole) in OSA with depressive symptoms group was less than that in OSA without depressive symptoms group (p = .025).