condition mean min max ZT0-3 8.4925 8.4925 8.4925 ZT4-7 9.340902499999999 9.340902499999999 9.340902499999999 ZT8-11 8.983973 8.983973 8.983973 ZT12-15 9.7104885 9.7104885 9.7104885 ZT16-19 8.808145 8.808145 8.808145 ZT20-23 8.7153595 8.7153595 8.7153595