condition mean min max ZT0-3 1.8933200000000001 1.8933200000000001 1.8933200000000001 ZT4-7 1.6583999999999999 1.6583999999999999 1.6583999999999999 ZT8-11 3.039395 3.039395 3.039395 ZT12-15 2.90439 2.90439 2.90439 ZT16-19 5.446895 5.446895 5.446895 ZT20-23 2.215565 2.215565 2.215565