condition mean min max ZT0-3 9.85 9.85 9.85 ZT4-7 17.8 17.8 17.8 ZT8-11 15.75 15.75 15.75 ZT12-15 13.350000000000001 13.350000000000001 13.350000000000001 ZT16-19 43.05 43.05 43.05 ZT20-23 8.25 8.25 8.25