condition mean min max ZT0-3 84.283949 84.283949 84.283949 ZT4-7 99.60819 99.60819 99.60819 ZT8-11 108.351122 108.351122 108.351122 ZT12-15 91.352904 91.352904 91.352904 ZT16-19 93.204827 93.204827 93.204827 ZT20-23 119.305589 119.305589 119.305589