condition mean min max ZT0-3 7.811405000000001 7.587115000000001 8.035695 ZT4-7 9.535810000000001 9.535810000000001 9.535810000000001 ZT8-11 8.439115000000001 8.439115000000001 8.439115000000001 ZT12-15 0 0 0 ZT16-19 10.145405 10.145405 10.145405 ZT20-23 11.430250000000001 11.430250000000001 11.430250000000001