condition mean min max ZT0-3 17.0 17.0 17.0 ZT4-7 9.8 9.8 9.8 ZT8-11 34.7 34.7 34.7 ZT12-15 18.4 18.4 18.4 ZT16-19 32.55 32.55 32.55 ZT20-23 11.65 11.65 11.65