condition mean min max ZT0-3 169.721774 169.721774 169.721774 ZT4-7 246.85870549999999 246.85870549999999 246.85870549999999 ZT8-11 244.0121115 244.0121115 244.0121115 ZT12-15 189.6976525 189.6976525 189.6976525 ZT16-19 151.2539515 151.2539515 151.2539515 ZT20-23 158.010838 158.010838 158.010838