condition mean min max ZT0-3 2.8616525 2.48718 3.2361250000000004 ZT4-7 0.7200335 0.7200335 0.7200335 ZT8-11 0.73117 0.73117 0.73117 ZT12-15 0 0 0 ZT16-19 5.299215 5.299215 5.299215 ZT20-23 2.487895 2.487895 2.487895