condition mean min max ZT0-3 7.17771 6.844725 7.510695 ZT4-7 8.478259999999999 8.478259999999999 8.478259999999999 ZT8-11 17.5785 17.5785 17.5785 ZT12-15 0 0 0 ZT16-19 12.69025 12.69025 12.69025 ZT20-23 11.6593 11.6593 11.6593