condition mean min max ZT0-3 0.20096725 0.1985595 0.203375 ZT4-7 0.4052635 0.4052635 0.4052635 ZT8-11 0.6780444999999999 0.6780444999999999 0.6780444999999999 ZT12-15 0 0 0 ZT16-19 0.467098 0.467098 0.467098 ZT20-23 0.267469 0.267469 0.267469