condition mean min max ZT0-3 0.87763225 0.8703615 0.884903 ZT4-7 0.584539 0.584539 0.584539 ZT8-11 1.3835199999999999 1.3835199999999999 1.3835199999999999 ZT12-15 0 0 0 ZT16-19 2.2242550000000003 2.2242550000000003 2.2242550000000003 ZT20-23 1.361415 1.361415 1.361415