condition mean min max ZT0-3 10.384529 10.384529 10.384529 ZT4-7 10.953649 10.953649 10.953649 ZT8-11 10.6237765 10.6237765 10.6237765 ZT12-15 10.513108500000001 10.513108500000001 10.513108500000001 ZT16-19 10.230033 10.230033 10.230033 ZT20-23 9.877039499999999 9.877039499999999 9.877039499999999