condition mean min max ZT0-3 5.70772 5.70772 5.70772 ZT4-7 5.73357 5.73357 5.73357 ZT8-11 2.9847200000000003 2.9847200000000003 2.9847200000000003 ZT12-15 1.89238 1.89238 1.89238 ZT16-19 1.2751510000000001 1.2751510000000001 1.2751510000000001 ZT20-23 2.30277 2.30277 2.30277