condition mean min max ZT0-3 58.265266 58.265266 58.265266 ZT4-7 185.128174 185.128174 185.128174 ZT8-11 542.7110365000001 542.7110365000001 542.7110365000001 ZT12-15 468.4333595 468.4333595 468.4333595 ZT16-19 347.62465 347.62465 347.62465 ZT20-23 162.171958 162.171958 162.171958