condition mean min max ZT0-3 6.2613900000000005 5.75681 6.76597 ZT4-7 10.08248 10.08248 10.08248 ZT8-11 2.79258 2.79258 2.79258 ZT12-15 0 0 0 ZT16-19 4.537745 4.537745 4.537745 ZT20-23 5.33713 5.33713 5.33713