condition mean min max ZT0-3 92.33211666666666 79.7788 115.75015 ZT4-7 69.02855 69.02855 69.02855 ZT8-11 38.0276 38.0276 38.0276 ZT12-15 34.389175 27.598 41.180350000000004 ZT16-19 32.6494 32.6494 32.6494 ZT20-23 83.74795 83.74795 83.74795