condition mean min max ZT0-3 9.751000000000001 9.751000000000001 9.751000000000001 ZT4-7 8.94304 8.94304 8.94304 ZT8-11 10.007555 10.007555 10.007555 ZT12-15 9.48664 9.48664 9.48664 ZT16-19 11.6105 11.6105 11.6105 ZT20-23 9.543949999999999 9.543949999999999 9.543949999999999