Table 4. Intra-class correlations for maturity offset, stature, body mass and YYIR1 by 2- and 4-year intervals. Overall (n=21) Low (n=7) Average (n=7) high(n=7) 2y stability ICC 95% CI ICC 95% CI ICC 95% CI ICC 95% CI Maturity OffSet .97 .95 - .98 .97 .94 - .98 .97 .93 - .98 .97 .54 - .86 Stature .94 .91 - .96 .92 .86 - .96 .95 .91 - .98 .93 .86 - .97 Body mass .94 .92 - .96 .95 .90 - .98 .93 .88 - .97 .94 .88 - .97 YYIR1 .76 .68 - .84 .43 .18 - .67 .68 .48 - .82 .73 .54 - .86 Overall (n=21) Low (n=7) Average (n=7) High (n=7) 4y stability ICC 95% CI ICC 95% CI ICC 95% CI ICC 95% CI Maturity OffSet .66 .44 - .83 .59 .12 - .90 .74 .34 - .94 .48 .00 - .86 Stature .57 .32 - .78 .27 -.17 - .71 .54 .07 - .89 .70 .28 - .93 Body mass .75 .57 - .88 .73 .32 - .94 .81 .47 - .96 -.38 .09 - .82 YYIR1 .59 .34 - .79 .38 -.09 - .83 .36 -.11 - .82 -.44 .04 - .87