condition mean min max ZT0-3 3758.440532 3758.440532 3758.440532 ZT4-7 4985.752584 4985.752584 4985.752584 ZT8-11 8623.727813500002 8623.727813500002 8623.727813500002 ZT12-15 7044.4767835 7044.4767835 7044.4767835 ZT16-19 5820.1278695 5820.1278695 5820.1278695 ZT20-23 2989.72353 2989.72353 2989.72353