condition mean min max ZT0-3 9.629312500000001 9.564695 9.69393 ZT4-7 7.360985 7.360985 7.360985 ZT8-11 8.32726 8.32726 8.32726 ZT12-15 0 0 0 ZT16-19 11.0426 11.0426 11.0426 ZT20-23 10.861515 10.861515 10.861515