condition mean min max ZT0-3 4.8377275 4.17197 5.5034849999999995 ZT4-7 6.13015 6.13015 6.13015 ZT8-11 0.8329625 0.8329625 0.8329625 ZT12-15 0 0 0 ZT16-19 7.38821 7.38821 7.38821 ZT20-23 6.87174 6.87174 6.87174