condition mean min max ZT0-3 38.78525 34.81675 42.75375 ZT4-7 53.9346 53.9346 53.9346 ZT8-11 50.3202 50.3202 50.3202 ZT12-15 0 0 0 ZT16-19 82.42150000000001 82.42150000000001 82.42150000000001 ZT20-23 60.480599999999995 60.480599999999995 60.480599999999995