Trends in sleep problems and patterns among Japanese adolescents: 2004 to 2017.

The statistical tests for all analyses remained highly significant ( p <0•001), suggesting that the results are robust to these alternative definitions of sleep problems.

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Twenty-eight out of the 33 countries showed an increasing trend in the prevalence of difficulty falling asleep during the 12-year period, except for Greece (− 4•3%), Spain (− 4•1%), Norway (− 2•0%), England (− 1•7%), and Portugal (− 1•3%) [12] .

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