condition mean min max ZT0-3 0.19236466666666668 0.0 0.3836415 ZT4-7 0.352296 0.352296 0.352296 ZT8-11 0.185583 0.185583 0.185583 ZT12-15 0.3735575 0.360966 0.38614899999999996 ZT16-19 0.52468 0.52468 0.52468 ZT20-23 0.981792 0.981792 0.981792