condition mean min max ZT0-3 58.630799987500005 42.915388275 74.34621170000001 ZT4-7 32.86735301 32.100740025 33.633965995 ZT8-11 37.287071805 30.47517321 44.0989704 ZT12-15 60.6356482775 56.234605245 65.03669131000001 ZT16-19 72.1990522925 70.395617975 74.00248661 ZT20-23 69.58920548500001 68.26314288500001 70.91526808500001