condition mean min max ZT0-3 10.906518 10.906518 10.906518 ZT4-7 9.817262 9.817262 9.817262 ZT8-11 10.267140999999999 10.267140999999999 10.267140999999999 ZT12-15 8.897727 8.897727 8.897727 ZT16-19 9.757091500000001 9.757091500000001 9.757091500000001 ZT20-23 9.481307000000001 9.481307000000001 9.481307000000001