condition mean min max ZT0-3 8.1460425 7.758319999999999 8.533764999999999 ZT4-7 6.75412 6.75412 6.75412 ZT8-11 5.056699999999999 5.056699999999999 5.056699999999999 ZT12-15 0 0 0 ZT16-19 7.322255 7.322255 7.322255 ZT20-23 7.402645 7.402645 7.402645