Increased nighttime light exposure is linearly associated with a higher probability of worse major depressive symptoms.

“and then once you get to that fourth quartile it's a big step it's like a 30% greater risk of self yeah so it's totally flat the first second third quartile no different and then fourth big jump”

“the increasing light at night and the impact on depression let me be really technical in what I say and the relationship or correlation to depression is very strong”

“basically when you go from the second to third quartile of nighttime light exposure so more than nighttime light exposure you basically go from no significant increase to almost almost a 20% increase and then as you get up to the fourth quartile so the most nighttime light exposure you're at about 25% increase in major depressive symptoms”