"I think the number on "Paid work and study" had quite significant differences" It could simply mean that in Japan a higher percentage of people have paid work

"I think the number on "Paid work and study" had quite significant differences" It could simply mean that in Japan a higher percentage of people have paid work compared to the other countries, like children work earlier, old people die sooner after employment ends (in France many retire in their 50s), higher percentage of employed women, less unemployment etc. pp. Not very useful data.