condition mean min max ZT0-3 268.0 268.0 268.0 ZT4-7 203.6 203.6 203.6 ZT8-11 185.75 185.75 185.75 ZT12-15 207.39999999999998 207.39999999999998 207.39999999999998 ZT16-19 230.9 230.9 230.9 ZT20-23 245.5 245.5 245.5