condition mean min max ZT0-3 8.806213851833334 7.664261189 9.948166514666667 ZT4-7 10.714133454999999 10.345142081666665 11.083124828333334 ZT8-11 9.677228657833334 9.304525670666667 10.049931645000001 ZT12-15 11.472647154166667 11.342298373333334 11.602995935000001 ZT16-19 13.481159648333332 12.5018061 14.460513196666666 ZT20-23 14.90161501 14.3286847 15.474545319999999