condition mean min max ZT0-3 27.4576 25.58495 29.33025 ZT4-7 23.6903 23.6903 23.6903 ZT8-11 12.361350000000002 12.361350000000002 12.361350000000002 ZT12-15 0 0 0 ZT16-19 21.05775 21.05775 21.05775 ZT20-23 26.32045 26.32045 26.32045