condition mean min max ZT0-3 23.135800000000003 23.124200000000002 23.1474 ZT4-7 19.4985 19.4985 19.4985 ZT8-11 19.1428 19.1428 19.1428 ZT12-15 0 0 0 ZT16-19 21.97605 21.97605 21.97605 ZT20-23 23.66415 23.66415 23.66415