condition mean min max ZT0-3 17.616578 17.616578 17.616578 ZT4-7 17.784945999999998 17.784945999999998 17.784945999999998 ZT8-11 21.243251 21.243251 21.243251 ZT12-15 21.336497 21.336497 21.336497 ZT16-19 24.738622499999998 24.738622499999998 24.738622499999998 ZT20-23 22.353122 22.353122 22.353122