condition mean min max ZT0-3 4.5178075 4.475275 4.56034 ZT4-7 8.329425 8.329425 8.329425 ZT8-11 8.10716 8.10716 8.10716 ZT12-15 0 0 0 ZT16-19 4.96428 4.96428 4.96428 ZT20-23 6.277205 6.277205 6.277205