condition mean min max ZT0-3 14.858034 14.858034 14.858034 ZT4-7 17.1391425 17.1391425 17.1391425 ZT8-11 16.618979 16.618979 16.618979 ZT12-15 16.366509 16.366509 16.366509 ZT16-19 25.1352665 25.1352665 25.1352665 ZT20-23 21.844125 21.844125 21.844125