condition mean min max ZT0-3 1.20167625 0.7422725 1.6610800000000001 ZT4-7 1.424695 1.424695 1.424695 ZT8-11 0.746534 0.746534 0.746534 ZT12-15 0 0 0 ZT16-19 1.53235 1.53235 1.53235 ZT20-23 2.54578 2.54578 2.54578