condition mean min max ZT0-3 231.64999999999998 231.64999999999998 231.64999999999998 ZT4-7 292.2 292.2 292.2 ZT8-11 278.05 278.05 278.05 ZT12-15 237.14999999999998 237.14999999999998 237.14999999999998 ZT16-19 251.65 251.65 251.65 ZT20-23 360.15 360.15 360.15