condition mean min max ZT0-3 5.263735 5.1043199999999995 5.42315 ZT4-7 4.0104999999999995 4.0104999999999995 4.0104999999999995 ZT8-11 2.868445 2.868445 2.868445 ZT12-15 0 0 0 ZT16-19 5.45068 5.45068 5.45068 ZT20-23 6.07444 6.07444 6.07444