condition mean min max ZT0-3 11.178197 11.178197 11.178197 ZT4-7 11.963474999999999 11.963474999999999 11.963474999999999 ZT8-11 12.6478055 12.6478055 12.6478055 ZT12-15 11.602916 11.602916 11.602916 ZT16-19 12.2761305 12.2761305 12.2761305 ZT20-23 12.943743999999999 12.943743999999999 12.943743999999999