Table 2.

Descriptive statistics of items of the Social Physique Anxiety Scale (SPAS) and differential item functioning (DIF) analysis

	SPAS-A						SPAS-B
Item	Mean	Median	Mode	SD	Skewness	Kurtosis	Mean	Median	Mode	SD	Skewness	Kurtosis	DIF‡
1†	2.79	3.00	3.00	1.10	− 0.12	− 0.88	2.70	3.00	2.00	1.16	0.38	− 0.58	< 0.001*
2†	2.59	3.00	3.00	1.18	0.16	− 0.98	2.59	3.00	3.00	1.22	0.27	− 0.87	< .001*
3	2.87	3.00	2.00	1.30	0.27	− 1.09	2.72	2.00	2.00	1.38	0.31	− 1.19	0.602
4	2.60	2.00	2.00	1.27	0.42	− 0.89	2.47	2.00	1.00	1.26	0.45	− 0.83	0.259
5†	2.69	3.00	3.00	1.02	− 0.13	− 0.69	2.55	2.00	2.00	1.13	0.44	− 0.57	< .001*
6	2.53	2.00	2.00	1.21	0.51	− 0.70	2.51	2.00	2.00	1.25	0.52	− 0.71	0.448
7	2.24	2.00	2.00	1.14	0.81	− 0.08	2.20	2.00	2.00	1.14	0.78	− 0.18	0.920
8†	2.76	3.00	3.00	1.05	− 0.20	− 0.97	2.25	2.00	2.00	1.19	0.78	− 0.28	< .001*
9	3.27	3.00	3.00	1.26	− 0.10	− 1.08	3.10	3.00	3.00	1.26	− 0.01	− 1.05	0.624
10	3.00	3.00	3.00	1.18	0.12	− 0.82	2.93	3.00	2.00	1.22	0.08	− 1.02	0.458
11†	1.91	2.00	1.00	.94	0.63	− 0.71	2.96	3.00	2.00	1.24	0.10	− 1.01	< 0.001*
12	2.83	3.00	2.00	1.25	0.25	− 0.93	2.74	3.00	2.00	1.29	0.30	− 0.93	0.480

SD standard deviation, SPAS-A items with original wording (i.e., seven regular items and five reversed items), SPAS-B all items with wording in the same direction (i.e., regular items)

^†Reversed items in the SPAS-A version

^‡p value for differential item functioning using for Chi-square test (SPAS-A vs. SPAS-B)

^*p < 0.05