condition mean min max ZT0-3 12.248275 10.4799 14.01665 ZT4-7 9.873975000000002 9.873975000000002 9.873975000000002 ZT8-11 9.99793 9.99793 9.99793 ZT12-15 0 0 0 ZT16-19 20.1246 20.1246 20.1246 ZT20-23 17.6035 17.6035 17.6035