condition mean min max ZT0-3 28.00985 28.00985 28.00985 ZT4-7 26.1756 26.1756 26.1756 ZT8-11 18.48985 18.48985 18.48985 ZT12-15 11.3097 11.3097 11.3097 ZT16-19 18.85935 18.85935 18.85935 ZT20-23 15.2536 15.2536 15.2536