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size 14 suitable for inner length 14cm reference age 15 to 18 months size 17 suitable for inner length 17cm reference age 4 to 4.5 years old size 18 participants suitable for inner length 18cm test age 4.5 to 5 years old size 19 suitable for inner length 19cm reference age 5 to 6 years old size 20 participants are suitable for the inner length of 20cm. the examination age is 7 to 8 years old. size 21 suitable for inner length 21cm reference age 9-10 years old