condition mean min max ZT0-3 1.4605952037499998 0.8336212854999999 2.0875691219999997 ZT4-7 1.3774161717500002 1.1007065040000001 1.6541258395 ZT8-11 1.50763889575 1.4190185325 1.596259259 ZT12-15 0.75266855825 0.5689900555 0.936347061 ZT16-19 0.8198312265000001 0.694672406 0.9449900470000001 ZT20-23 1.5323852135 1.381441303 1.6833291240000001