condition mean min max ZT0-3 260.6 260.6 260.6 ZT4-7 382.7 382.7 382.7 ZT8-11 367.2 367.2 367.2 ZT12-15 365.45 365.45 365.45 ZT16-19 406.84999999999997 406.84999999999997 406.84999999999997 ZT20-23 263.8 263.8 263.8