condition mean min max ZT0-3 26.93625 26.93625 26.93625 ZT4-7 15.79475 15.79475 15.79475 ZT8-11 14.47415 14.47415 14.47415 ZT12-15 22.1301 22.1301 22.1301 ZT16-19 24.518050000000002 24.518050000000002 24.518050000000002 ZT20-23 26.7867 26.7867 26.7867