condition mean min max ZT0-3 10.870172499999999 10.3057 11.434645 ZT4-7 9.409344999999998 9.409344999999998 9.409344999999998 ZT8-11 15.049900000000001 15.049900000000001 15.049900000000001 ZT12-15 0 0 0 ZT16-19 15.02965 15.02965 15.02965 ZT20-23 14.84315 14.84315 14.84315