condition mean min max ZT0-3 66.80145 66.80145 66.80145 ZT4-7 47.86085 47.86085 47.86085 ZT8-11 43.93415 43.93415 43.93415 ZT12-15 59.4725 59.4725 59.4725 ZT16-19 61.72605 61.72605 61.72605 ZT20-23 57.26325 57.26325 57.26325