condition mean min max ZT0-3 14.249025 13.82685 14.671199999999999 ZT4-7 11.885 11.885 11.885 ZT8-11 21.46855 21.46855 21.46855 ZT12-15 0 0 0 ZT16-19 22.6368 22.6368 22.6368 ZT20-23 16.3507 16.3507 16.3507