condition mean min max ZT0-3 4.598635 2.7111400000000003 6.02015 ZT4-7 1.98394 1.98394 1.98394 ZT8-11 1.94013 1.94013 1.94013 ZT12-15 4.5529174999999995 2.984585 6.12125 ZT16-19 4.403700000000001 4.403700000000001 4.403700000000001 ZT20-23 6.99191 6.99191 6.99191