condition mean min max ZT0-3 2329.60033 2329.60033 2329.60033 ZT4-7 2828.8917094999997 2828.8917094999997 2828.8917094999997 ZT8-11 2445.2026305 2445.2026305 2445.2026305 ZT12-15 2456.7356375 2456.7356375 2456.7356375 ZT16-19 2324.6426414999996 2324.6426414999996 2324.6426414999996 ZT20-23 1971.4910224999999 1971.4910224999999 1971.4910224999999