condition mean min max ZT0-3 11.3288575 10.140365 12.51735 ZT4-7 7.42121 7.42121 7.42121 ZT8-11 5.7770600000000005 5.7770600000000005 5.7770600000000005 ZT12-15 0 0 0 ZT16-19 14.2836 14.2836 14.2836 ZT20-23 14.633199999999999 14.633199999999999 14.633199999999999