condition mean min max ZT0-3 255.10000000000002 255.10000000000002 255.10000000000002 ZT4-7 230.7 230.7 230.7 ZT8-11 235.79999999999998 235.79999999999998 235.79999999999998 ZT12-15 240.55 240.55 240.55 ZT16-19 241.65 241.65 241.65 ZT20-23 252.55 252.55 252.55