condition mean min max ZT0-3 13.117291 13.117291 13.117291 ZT4-7 22.8900085 22.8900085 22.8900085 ZT8-11 37.433214500000005 37.433214500000005 37.433214500000005 ZT12-15 37.093858499999996 37.093858499999996 37.093858499999996 ZT16-19 19.8495545 19.8495545 19.8495545 ZT20-23 15.867851 15.867851 15.867851