condition mean min max ZT0-3 27.75 27.75 27.75 ZT4-7 5.7 5.7 5.7 ZT8-11 27.450000000000003 27.450000000000003 27.450000000000003 ZT12-15 13.35 13.35 13.35 ZT16-19 53.15 53.15 53.15 ZT20-23 15.4 15.4 15.4