Comment Re:Self-selection (Score 2) 60
Turning the link purple to go to the report, then following that link to the actual study, you can look at those concerns.
Oddly enough, the post-doc researchers at University College London doing research in behavioral science and psychiatry, published through Oxford University, do indeed answer the questions.
The paper shows is something they noticed and want to investigate further, presented as "the first evidence" not a final conclusion. They started from the UK Household Longitudinal Study data, data going back to 1991 and publicly available to any registered researcher, and cross checked against a few others with related sampling information. They looked at ages from 16 to 90, marital status, children, education level, employment status, household income, area deprivation index (living in poor areas to rich areas) and reported disabilities.