condition mean min max ZT0-3 306.86465 306.86465 306.86465 ZT4-7 193.8699775 193.8699775 193.8699775 ZT8-11 235.28515249999998 235.28515249999998 235.28515249999998 ZT12-15 281.11481000000003 281.11481000000003 281.11481000000003 ZT16-19 441.9851625 441.9851625 441.9851625 ZT20-23 348.999602 348.999602 348.999602