condition mean min max ZT0-3 0.2752831666666667 0.1841355 0.3222045 ZT4-7 0.153189 0.153189 0.153189 ZT8-11 0.249017 0.249017 0.249017 ZT12-15 0.9828135 0.8871455 1.0784815 ZT16-19 0.6685099999999999 0.6685099999999999 0.6685099999999999 ZT20-23 0.8662575 0.8662575 0.8662575