condition mean min max ZT0-3 9.1 9.1 9.1 ZT4-7 24.5 24.5 24.5 ZT8-11 7.75 7.75 7.75 ZT12-15 8.85 8.85 8.85 ZT16-19 7.55 7.55 7.55 ZT20-23 15.350000000000001 15.350000000000001 15.350000000000001