condition mean min max ZT0-3 7.1849225 7.084555 7.28529 ZT4-7 8.83427 8.83427 8.83427 ZT8-11 8.414439999999999 8.414439999999999 8.414439999999999 ZT12-15 0 0 0 ZT16-19 9.86688 9.86688 9.86688 ZT20-23 10.47945 10.47945 10.47945