condition mean min max ZT0-3 2.9981475 2.551295 3.4450000000000003 ZT4-7 3.23756 3.23756 3.23756 ZT8-11 6.7447099999999995 6.7447099999999995 6.7447099999999995 ZT12-15 0 0 0 ZT16-19 9.48271 9.48271 9.48271 ZT20-23 5.0561050000000005 5.0561050000000005 5.0561050000000005