condition mean min max ZT0-3 613.385346 613.385346 613.385346 ZT4-7 551.084022 551.084022 551.084022 ZT8-11 493.5652625 493.5652625 493.5652625 ZT12-15 546.348564 546.348564 546.348564 ZT16-19 613.6276379999999 613.6276379999999 613.6276379999999 ZT20-23 603.4849095 603.4849095 603.4849095