Table 11.

The average height of the 8 pillows tested by 30 subjects

Pillow	Average height (mm)
No. 1	21.12
No. 2	21.39
No. 3	21.40
No. 4	22.25
No. 5	20.06
No. 6	20.49
No. 7	20.44
No. 8	21.57

The height is the sum of the head and the pillow (units: millimeters).