condition mean min max ZT0-3 311.51126 311.51126 311.51126 ZT4-7 281.33295499999997 281.33295499999997 281.33295499999997 ZT8-11 412.428739 412.428739 412.428739 ZT12-15 526.0100645 526.0100645 526.0100645 ZT16-19 397.3126585 397.3126585 397.3126585 ZT20-23 263.38131799999996 263.38131799999996 263.38131799999996