condition mean min max ZT0-3 26.090528 26.090528 26.090528 ZT4-7 368.869195 368.869195 368.869195 ZT8-11 719.014021 719.014021 719.014021 ZT12-15 551.620673 551.620673 551.620673 ZT16-19 202.8818005 202.8818005 202.8818005 ZT20-23 30.0059115 30.0059115 30.0059115