condition mean min max ZT0-3 14.984206 14.984206 14.984206 ZT4-7 14.869509 14.869509 14.869509 ZT8-11 15.138827500000001 15.138827500000001 15.138827500000001 ZT12-15 12.664677 12.664677 12.664677 ZT16-19 16.942826 16.942826 16.942826 ZT20-23 16.499844500000002 16.499844500000002 16.499844500000002