condition mean min max ZT0-3 1.352335 1.352335 1.352335 ZT4-7 1.4284219999999999 1.4284219999999999 1.4284219999999999 ZT8-11 1.113027 1.113027 1.113027 ZT12-15 0.9316445 0.9316445 0.9316445 ZT16-19 1.4567100000000002 1.4567100000000002 1.4567100000000002 ZT20-23 1.213945 1.213945 1.213945