Table 2.

Item means, standard deviations, item-total correlations, and planned factors based on Harari et al. (2013) and theory.

#	Item	Mean	SD	Item-total r	Planned factor
					Negative reactions	Numerical confidence	Worry
ORIGINAL MASYC ITEMS
1	Math gives me a stomachache.	1.32	0.85	0.54	X
2	When it is time for math my head hurts.	1.49	0.97	0.61	X
3	When it is time for math my heart beats fast.	1.93	1.21	0.47	X
4	Figuring out if I have enough money to buy cookies and a drink is fun.*	1.81	1.09	0.09		X
5	I like doing math problems on the board in front of the class.*	1.70	1.06	0.43		X
6	I like to raise my hand in math class.*	1.71	1.02	0.52	(X)	X
7	I like doing a math problem like this: 124 + 329*	1.76	1.12	0.29		X
8	I like being called on in math class.*	1.67	1.04	0.52		X
9	I get nervous about making a mistake in math.	2.54	1.27	0.44			X
10	When the teacher calls on me to tell my answer to the class, I get nervous.	2.06	1.22	0.62			X
11	I am scared in math class.	1.36	0.84	0.65	(X)		X
12	Getting out my math books makes me nervous.	1.29	0.78	0.56			X
NEWLY-DEVELOPED ITEMS
14	I get worried before I take a math test.	2.38	1.26	0.52			X
16	My heart starts to beat fast if I have to do math in my head.	1.70	1.06	0.51	X
17	I get nervous when my teacher is about to teach something new in math.	1.63	1.04	0.55			X
18	I get worried when I don't understand something in math.	2.40	1.22	0.50			X
21	I feel nervous when I am doing math.	1.57	1.01	0.69			X

Items are presented in the table in the same order as in Harari et al. (2013); Higher numbers indicate higher anxiety on a scale from 1 to 4;

^*Indicates than an item was reverse-coded such that higher numbers are equivalent to lower confidence. If an X is in parentheses it indicates that Harari et al found that it also loaded on this factor, but not as strongly as another factor.