condition mean min max ZT0-3 14.986650000000001 12.9084 17.0649 ZT4-7 9.493435000000002 9.493435000000002 9.493435000000002 ZT8-11 7.07644 7.07644 7.07644 ZT12-15 0 0 0 ZT16-19 9.058499999999999 9.058499999999999 9.058499999999999 ZT20-23 10.594650000000001 10.594650000000001 10.594650000000001