condition mean min max ZT0-3 618.833279 618.833279 618.833279 ZT4-7 875.747439 875.747439 875.747439 ZT8-11 945.132025 945.132025 945.132025 ZT12-15 890.5183265000001 890.5183265000001 890.5183265000001 ZT16-19 785.6416340000001 785.6416340000001 785.6416340000001 ZT20-23 1534.347563 1534.347563 1534.347563