condition mean min max ZT0-3 0.69273275 0.5798989999999999 0.8055665 ZT4-7 0.6578205 0.6578205 0.6578205 ZT8-11 0.6075474999999999 0.6075474999999999 0.6075474999999999 ZT12-15 0 0 0 ZT16-19 1.2187125 1.2187125 1.2187125 ZT20-23 1.770725 1.770725 1.770725