condition mean min max ZT0-3 542.565036 542.565036 542.565036 ZT4-7 536.23698 536.23698 536.23698 ZT8-11 497.3474415 497.3474415 497.3474415 ZT12-15 496.27391 496.27391 496.27391 ZT16-19 449.8237095 449.8237095 449.8237095 ZT20-23 455.1616525 455.1616525 455.1616525