condition mean min max ZT0-3 53.396275 51.07355 55.719 ZT4-7 254.064 254.064 254.064 ZT8-11 233.6075 233.6075 233.6075 ZT12-15 0 0 0 ZT16-19 104.01050000000001 104.01050000000001 104.01050000000001 ZT20-23 84.8118 84.8118 84.8118