condition mean min max ZT0-3 0.604831 0.439831 0.6971465 ZT4-7 0.736777 0.736777 0.736777 ZT8-11 0.250285 0.250285 0.250285 ZT12-15 0.76229375 0.753331 0.7712565 ZT16-19 0.7921235 0.7921235 0.7921235 ZT20-23 1.153533 1.153533 1.153533