Research suggests that the age at which toilet training takes place has risen over the years.In 1957,what percentage of children had been toilet trained by 18 months of age?

Question

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A study conducted in 1957 found that 92% of children had been toilet trained by 18 months of age. This suggests that the age at which toilet training takes place has indeed risen over the years.

Research Suggests That the Age at Which Toilet Training Takes