condition mean min max ZT0-3 10.829067 10.829067 10.829067 ZT4-7 10.555396 10.555396 10.555396 ZT8-11 9.614654999999999 9.614654999999999 9.614654999999999 ZT12-15 9.074628 9.074628 9.074628 ZT16-19 9.417127 9.417127 9.417127 ZT20-23 9.157009500000001 9.157009500000001 9.157009500000001