condition mean min max ZT0-3 100.770524 100.770524 100.770524 ZT4-7 81.3228775 81.3228775 81.3228775 ZT8-11 93.2946765 93.2946765 93.2946765 ZT12-15 94.680813 94.680813 94.680813 ZT16-19 112.088774 112.088774 112.088774 ZT20-23 127.853624 127.853624 127.853624