condition mean min max ZT0-3 10.828643333333334 8.105550000000001 13.4307 ZT4-7 7.651339999999999 7.651339999999999 7.651339999999999 ZT8-11 7.57744 7.57744 7.57744 ZT12-15 10.6479275 10.60215 10.693705 ZT16-19 9.33521 9.33521 9.33521 ZT20-23 12.78465 12.78465 12.78465