I thought that was common knowledge but apparently it isn't.

Singlehood: https://www.investmentexecutive.com/newspaper_/building-your-business-newspaper/singles-a-growing-demographic/

Depression: https://www.researchgate.net/figure/Randomized-studies-examining-psychotherapy-for-adult-depression-Absolute-number-per_fig1_51503768

Anxiety: https://www.sciencedirect.com/science/article/pii/S0022395620309250