condition mean min max ZT0-3 9.368883 9.368883 9.368883 ZT4-7 8.8210405 8.8210405 8.8210405 ZT8-11 13.0491295 13.0491295 13.0491295 ZT12-15 8.082554 8.082554 8.082554 ZT16-19 10.354737499999999 10.354737499999999 10.354737499999999 ZT20-23 14.1141015 14.1141015 14.1141015