I live in France. One thing that comes to mind is hesitancy to report it due to parents not taking their children to hospital.

The other thing is that there is a lot of pressure put on children starting in middle school.

I teach at a business school and the students tell it like this:

• growing up their parents sign them up for extra curriculars, usually 2 days a week;
• starting middle school, they must cope with the joys of adolescence on top of extracurriculars and teachers telling them that the brevet is the most important thing ever;
• the brevet is a test that helps determine their parcours, or education path;
• getting into a good high school is very important for some students;
• once arriving in high school they begin to prep for the final exams, the baccalauréat (the Bac);
• there is a very poorly designed thing called Parcoursup that determines post-secondary education choices...

Basically, students are told again and again that everything they do is the most important thing.

Some of my students are still so traumatized that they cry if they get below 75% (15/20). To underline how things have changed, in 2006 (when I moved to France) students used to applaud each other for getting higher than 60% (12/20) but now everything is ranked. Add in hormones and social media and anxiety... Lots of burn out and depression.