condition mean min max ZT0-3 6.7315925 6.414785 7.0484 ZT4-7 1.7121300000000002 1.7121300000000002 1.7121300000000002 ZT8-11 0.4376865 0.4376865 0.4376865 ZT12-15 0 0 0 ZT16-19 0.9165220000000001 0.9165220000000001 0.9165220000000001 ZT20-23 2.251605 2.251605 2.251605