Each column generally represents a single variable; however, one variable may span several columns. At the most basic level, a codebook describes the layout of the data in the data file and describes what the data codes mean. Codebooks are used to document the values associated with the answer options for a given survey question. Each answer category is given a unique numeric value, and these unique numeric values are then used by ...
The fetal attitude describes the position of the parts of your baby's body. The normal fetal attitude is commonly called the fetal position. 1  The head is tucked down to the chest.  The arms and legs are drawn in towards the center of the chest.
Slide show: Fetal ultrasound. A fetal ultrasound can give you an early glimpse of your baby, but it isn't done for parental thrills. A fetal ultrasound can help your health care provider evaluate your baby's growth and development and determine how your pregnancy is progressing.