condition mean min max ZT0-3 7.6979394055 6.072646 9.323232811 ZT4-7 3.993573905 3.6816674585 4.3054803515 ZT8-11 2.15937967325 1.791507159 2.5272521875 ZT12-15 2.98256106075 2.4415076155 3.523614506 ZT16-19 4.42065533675 3.4014790395 5.439831634 ZT20-23 11.53777981175 8.187769375 14.8877902485