condition mean min max ZT0-3 0.231151 0.206497 0.255805 ZT4-7 0.3364255 0.3364255 0.3364255 ZT8-11 0.4125625 0.4125625 0.4125625 ZT12-15 0 0 0 ZT16-19 0.3048715 0.3048715 0.3048715 ZT20-23 0.48440150000000004 0.48440150000000004 0.48440150000000004