condition mean min max ZT0-3 34.326346 34.326346 34.326346 ZT4-7 26.772798 26.772798 26.772798 ZT8-11 36.1834195 36.1834195 36.1834195 ZT12-15 39.01513 39.01513 39.01513 ZT16-19 48.2239245 48.2239245 48.2239245 ZT20-23 32.114157500000005 32.114157500000005 32.114157500000005