condition mean min max ZT0-3 12.223892 12.223892 12.223892 ZT4-7 12.969903500000001 12.969903500000001 12.969903500000001 ZT8-11 11.963484999999999 11.963484999999999 11.963484999999999 ZT12-15 12.8528 12.8528 12.8528 ZT16-19 14.097898 14.097898 14.097898 ZT20-23 12.223892 12.223892 12.223892