condition mean min max ZT0-3 42.3136366695 15.072252589 69.55502075 ZT4-7 11.6328899345 9.858580559 13.40719931 ZT8-11 14.942236467499999 12.49338495 17.391087985 ZT12-15 17.6739996775 14.643978775 20.70402058 ZT16-19 17.198001935 14.65037822 19.74562565 ZT20-23 25.449492665 23.322131045 27.576854285