condition mean min max ZT0-3 0.3111507575 0.19491079 0.42739072499999997 ZT4-7 1.2157274655 0.8234707240000001 1.6079842069999999 ZT8-11 3.2627892385 2.2495822440000004 4.275996233 ZT12-15 7.155830503250001 5.4330865245 8.878574482000001 ZT16-19 7.24069231925 6.839198114 7.6421865245 ZT20-23 9.042609595 7.3595655835 10.7256536065