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Table 1.

Number of measurements per time-point for each age category.

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Table 1 Expand

Table 2.

Descriptive statistics (Mean ± SD) for all age groups.

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Table 2 Expand

Fig 1.

Technical skills trend lines with 95% confidence intervals.

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Fig 1 Expand

Table 3.

Multilevel regression models for technical skills development: Parameter estimates (standard-errors) for fixed and random effects.

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Table 3 Expand