condition mean min max ZT0-3 2497.706368 2497.706368 2497.706368 ZT4-7 1260.9142135 1260.9142135 1260.9142135 ZT8-11 1185.9103905000002 1185.9103905000002 1185.9103905000002 ZT12-15 1129.8716605 1129.8716605 1129.8716605 ZT16-19 1760.7180575 1760.7180575 1760.7180575 ZT20-23 1654.657996 1654.657996 1654.657996