condition mean min max ZT0-3 0.6246675457499999 0.251332335 0.9980027564999999 ZT4-7 1.90071991125 1.8147856929999997 1.9866541295 ZT8-11 2.26534320125 2.0218520939999998 2.5088343085 ZT12-15 4.215187497 3.6566241324999997 4.7737508615 ZT16-19 6.1166155495 5.6719975875 6.561233511499999 ZT20-23 7.7593904065 6.964569238 8.554211575