condition mean min max ZT0-3 1.206255503 1.188071425 1.224439581 ZT4-7 0.9926586425 0.45117563399999994 1.534141651 ZT8-11 5.738367695500001 4.316652734500001 7.1600826565 ZT12-15 2.247292562 1.6984429815 2.7961421425 ZT16-19 1.601297369 1.408341035 1.7942537029999999 ZT20-23 0.9120128755000001 0.7577177365000001 1.0663080145000001