condition mean min max ZT0-3 4.96708 3.3514049999999997 6.44993 ZT4-7 2.75906 2.75906 2.75906 ZT8-11 3.60313 3.60313 3.60313 ZT12-15 7.553115 6.80994 8.296289999999999 ZT16-19 5.529325 5.529325 5.529325 ZT20-23 8.281305 8.281305 8.281305