condition mean min max ZT0-3 11.614041208249999 9.873389696499999 13.35469272 ZT4-7 7.12150893975 6.2693742535 7.973643626 ZT8-11 6.0896951034999995 5.359713087499999 6.8196771195 ZT12-15 10.436797141 8.689895247 12.183699035 ZT16-19 12.8220839975 11.740808905 13.90335909 ZT20-23 13.219551065000001 12.93042136 13.50868077