condition mean min max ZT0-3 29.463551 29.463551 29.463551 ZT4-7 35.202055 35.202055 35.202055 ZT8-11 33.983954499999996 33.983954499999996 33.983954499999996 ZT12-15 42.465114 42.465114 42.465114 ZT16-19 42.7002845 42.7002845 42.7002845 ZT20-23 41.79397 41.79397 41.79397