condition mean min max ZT0-3 8.60246 8.60246 8.60246 ZT4-7 5.873150000000001 5.873150000000001 5.873150000000001 ZT8-11 6.853305 6.853305 6.853305 ZT12-15 7.755555 7.755555 7.755555 ZT16-19 12.64285 12.64285 12.64285 ZT20-23 10.6068 10.6068 10.6068