condition mean min max ZT0-3 50.20025 50.20025 50.20025 ZT4-7 33.47065 33.47065 33.47065 ZT8-11 39.35665 39.35665 39.35665 ZT12-15 69.21805 69.21805 69.21805 ZT16-19 79.06129999999999 79.06129999999999 79.06129999999999 ZT20-23 69.1762 69.1762 69.1762