condition mean min max ZT0-3 14.8686645725 13.700825675 16.03650347 ZT4-7 7.7337317475 5.1464071895 10.3210563055 ZT8-11 10.850337950750001 8.8716732315 12.829002670000001 ZT12-15 15.485698105 15.2590285 15.71236771 ZT16-19 19.98810428 16.439533085 23.536675475000003 ZT20-23 33.590883575 26.994480799999998 40.18728635