condition mean min max ZT0-3 12.9 12.9 12.9 ZT4-7 18.1 18.1 18.1 ZT8-11 25.15 25.15 25.15 ZT12-15 15.75 15.75 15.75 ZT16-19 11.1 11.1 11.1 ZT20-23 23.450000000000003 23.450000000000003 23.450000000000003