See, this is where things go wrong. So they've got mean wage figures which are constructed both on a fact (hourly wage) and an assumption (working hours).
I know n=1 but, my girlfriend is a teacher and I see her working about 40 hours a week, for a 24h job. She has a 0.6 FTE contracted position (and an according 60% monthly salary), she's at the school about 4 days a week. On her off-day, every single evening before work and after work, and at least one, sometimes two days of the weekend, she's grading papers, designing exams, preparing lessons, calling up parents, responding to students on their education platform (some saas application on laptop & phone) etc etc.
There's no way she can handle a 1.0 position, she'd burn-out within 1 or 2 years. She knows this, all of her colleagues know this. Almost everyone works part-time.
She does teach difficult classes (lots of kids from low socioeconomic background, crappy parents, many distractions, little socialisation skills etc etc) but even teaching 'easy' kids, you'll still top-out at 0.8 FTE for the same mental effort / working hours / strain of 1.0 FTE at a 'normal' job (like mine, corporate job at a financial institution).
Hourly wages can't be straight-up compared between jobs high in mental or physical strain (e.g. teaching or construction) versus say an administrative office job. You just can't last 40 years working the former jobs at a full-time position. Not the average person.