condition mean min max ZT0-3 0.24353231425 0.082617896 0.40444673249999996 ZT4-7 0.36308706825 0.26376959099999997 0.4624045455 ZT8-11 0.9698241347500001 0.685856782 1.2537914875 ZT12-15 1.5594365795000003 1.2639805290000001 1.8548926300000002 ZT16-19 1.4430242435 1.3166594995 1.5693889875 ZT20-23 2.6465994175 2.452148703 2.8410501320000003