condition mean min max ZT0-3 40.43288333333333 32.02835 54.487049999999996 ZT4-7 47.2553 47.2553 47.2553 ZT8-11 57.50345 57.50345 57.50345 ZT12-15 156.34575 131.4425 181.249 ZT16-19 156.911 156.911 156.911 ZT20-23 92.04814999999999 92.04814999999999 92.04814999999999