condition mean min max ZT0-3 7.45 7.45 7.45 ZT4-7 10.4 10.4 10.4 ZT8-11 16.6 16.6 16.6 ZT12-15 15.049999999999999 15.049999999999999 15.049999999999999 ZT16-19 13.55 13.55 13.55 ZT20-23 20.55 20.55 20.55