condition mean min max ZT0-3 7.85 7.85 7.85 ZT4-7 23.3 23.3 23.3 ZT8-11 4.199999999999999 4.199999999999999 4.199999999999999 ZT12-15 23.85 23.85 23.85 ZT16-19 17.65 17.65 17.65 ZT20-23 19.450000000000003 19.450000000000003 19.450000000000003