condition mean min max ZT0-3 220.48266666666666 127.281 275.5985 ZT4-7 98.98255 98.98255 98.98255 ZT8-11 110.0035 110.0035 110.0035 ZT12-15 162.2 141.2865 183.1135 ZT16-19 250.9515 250.9515 250.9515 ZT20-23 334.076 334.076 334.076