condition mean min max ZT0-3 92.143925 90.63225 93.65559999999999 ZT4-7 75.0167 75.0167 75.0167 ZT8-11 66.46435 66.46435 66.46435 ZT12-15 0 0 0 ZT16-19 68.29390000000001 68.29390000000001 68.29390000000001 ZT20-23 76.80845 76.80845 76.80845