Table 3. Number of observation days and measurement samples per infant for the control and affected groups.

	No IVH	With IVH
Max observation days	13	14
Mean number of days±SD	9.8±0.8	2.7±2.8
Max measurements per day	8	9.2
Mean number of measurements per day±SD	2.4±1.4	2.4±1.5
Total number of measurements	2373	801