condition mean min max ZT0-3 2491.085709 2491.085709 2491.085709 ZT4-7 977.2020695 977.2020695 977.2020695 ZT8-11 1142.7184035 1142.7184035 1142.7184035 ZT12-15 1724.8371570000002 1724.8371570000002 1724.8371570000002 ZT16-19 3217.520276 3217.520276 3217.520276 ZT20-23 2388.7036630000002 2388.7036630000002 2388.7036630000002