condition mean min max ZT0-3 66.59325 66.59325 66.59325 ZT4-7 42.79195 42.79195 42.79195 ZT8-11 37.7061 37.7061 37.7061 ZT12-15 36.33525 36.33525 36.33525 ZT16-19 65.07884999999999 65.07884999999999 65.07884999999999 ZT20-23 75.25405 75.25405 75.25405