condition mean min max ZT0-3 0.4186066666666667 0.2920885 0.505649 ZT4-7 0.41443549999999996 0.41443549999999996 0.41443549999999996 ZT8-11 0.5820274999999999 0.5820274999999999 0.5820274999999999 ZT12-15 0.7678715 0.49188149999999997 1.0438615 ZT16-19 0.6474545 0.6474545 0.6474545 ZT20-23 0.3377166 0.3377166 0.3377166