condition mean min max ZT0-3 10.159205 10.159205 10.159205 ZT4-7 11.40105 11.40105 11.40105 ZT8-11 8.86212 8.86212 8.86212 ZT12-15 11.17635 11.17635 11.17635 ZT16-19 12.7821 12.7821 12.7821 ZT20-23 8.80801 8.80801 8.80801