Mark your selections and choose between table on screen and file format. Marking tips
For variables marked 
you need to select at least one value
Year
Time
Gestational age at delivery (weeks)
Index
Age group
Number of selected data cells are:(maximum number allowed is 800,000)
Presentation on screen is limited to 6,000 rows and 80 columns
Number of selected cells exceeds the maximum allowed 800,000