condition mean min max ZT0-3 13.770648333333334 10.600895000000001 15.4406 ZT4-7 8.77836 8.77836 8.77836 ZT8-11 7.908715000000001 7.908715000000001 7.908715000000001 ZT12-15 12.19155 11.649049999999999 12.73405 ZT16-19 11.3478 11.3478 11.3478 ZT20-23 15.99245 15.99245 15.99245