condition mean min max ZT0-3 7.685193333333333 6.753575 9.41958 ZT4-7 5.4626 5.4626 5.4626 ZT8-11 1.95232 1.95232 1.95232 ZT12-15 3.5736324999999995 2.803505 4.34376 ZT16-19 2.339335 2.339335 2.339335 ZT20-23 4.11872 4.11872 4.11872