Table 2.

Description of indices for knowledge, attitudes, referrals and concerns derived from a survey about referral patterns, knowledge and attitudes towards bariatric surgery and concerns about postoperative complications

Index	Numbers (N)	Mean value*	Median**	Min	Max	Standard deviation
Knowledge1	157	11.5	12	0	20.5	3.72
Attitudes2	1563	9.6	10	4	13	1.39
Referrals4	157	12.2	12	4	19	2.44
Concerns2	1556	16.4	16	6	25	4.22

** The value separating the higher half from the lower half of the data sample

¹Item 23–41, item 41 gives maximum 3 points

²Item 47, 51 and 53 reverse

³Missing = 1

⁴Item 7, 8, 10 and 9 reverse

⁵Item 42–46

⁶Missing = 2

*The sum of the values divided by the number of values.