condition mean min max ZT0-3 33.157300000000006 29.978900000000003 36.3357 ZT4-7 28.1428 28.1428 28.1428 ZT8-11 6.703515 6.703515 6.703515 ZT12-15 0 0 0 ZT16-19 15.84655 15.84655 15.84655 ZT20-23 26.69625 26.69625 26.69625