condition mean min max ZT0-3 11.1087025 9.612355 12.605049999999999 ZT4-7 22.8263 22.8263 22.8263 ZT8-11 49.4153 49.4153 49.4153 ZT12-15 0 0 0 ZT16-19 26.1408 26.1408 26.1408 ZT20-23 19.061700000000002 19.061700000000002 19.061700000000002