condition mean min max ZT0-3 10.175505000000001 10.175505000000001 10.175505000000001 ZT4-7 9.035264999999999 9.035264999999999 9.035264999999999 ZT8-11 9.654345 9.654345 9.654345 ZT12-15 10.457049999999999 10.457049999999999 10.457049999999999 ZT16-19 9.646805 9.646805 9.646805 ZT20-23 8.839205 8.839205 8.839205