condition mean min max ZT0-3 7.517284999999999 7.517284999999999 7.517284999999999 ZT4-7 3.578615 3.578615 3.578615 ZT8-11 8.88575 8.88575 8.88575 ZT12-15 8.131755 8.131755 8.131755 ZT16-19 9.390080000000001 9.390080000000001 9.390080000000001 ZT20-23 9.124305 9.124305 9.124305