Table 2.

T-test for independent samples of the experimental and control groups on social norms, self-efficacy, behavioural intention, and behaviour.

	Post-test 1a			Post-test 1b			Post-test 1c			Post-test 2a			Post-test 2b
Variables	t	df	p-value	t	df	p-value	t	df	p-value	t	df	p-value	t	df	p-value
SSN1	5.263	139	<0.001	3.612	137	<0.001	3.563	136	0.001	5.037	136	<0.001	3.5	97	0.001
SSN2	5.175	139	<0.001	3.404	137	0.001	3.884	136	<0.001	7.214	136	<0.001	4.831	97	<0.001
SSN3	5.531	139	<0.001	3.732	137	<0.001	4.358	136	<0.001	7.12	136	<0.001	3.868	97	<0.001
SSN4	5.195	139	<0.001	4.225	137	<0.001	4.176	136	<0.001	7.55	136	<0.001	4.698	97	<0.001
SSN5	5.624	139	<0.001	4.225	137	<0.001	4.839	136	<0.001	6.535	136	<0.001	4.053	97	<0.001
SSN6	5.66	139	<0.001	4.065	137	<0.001	4.626	136	<0.001	6.885	136	<0.001	5.123	97	<0.001
SSN7	6.773	139	<0.001	5.515	137	<0.001	5.982	136	<0.001	6.162	136	<0.001	4.787	97	< 001
SSN8	7.201	139	<0.001	5.191	137	<0.001	6.481	136	<0.001	6.809	136	<0.001	5.353	97	<0.001
Self-efficacy	2.563	139	0.011	1.495	68,16	0.140	1.237	69.36	0.220	2.505	53.80	0.015	2.055	53.80	0.007
Intention	2.472	139	0.015	2.508	137	0.013	1.869	136	0.064	3.230	136	0.002	2.913	97	0.004
Behaviour	–	–	–	0.863	137	0.389	2.064	136	0.041	–	–	–	3.158	97	0.002
	Post-test 3a			Post-test 3b			Post-test 4a			Post-test 4b			Post-test 4c
	t	df	p-value	t	df	p-value	t	df	p-value	t	df	p-value	t	df	p-value
SSN1	5.052	94	<0.001	3.868	82	<0.001	6.896	81	<0.001	4.736	81	<0.001	3.655	81	<0.001
SSN2	5.984	94	<0.001	3.936	82	<0.001	6.819	81	<0.001	3.394	81	0.001	2.718	81	0.008
SSN3	5.584	94	<0.001	3.483	82	0.001	4.944	81	<0.001	4.388	81	<0.001	3.186	81	0.002
SSN4	6.138	94	<0.001	3.986	82	<0.001	6.282	81	<0.001	5.452	81	<0.001	3.873	81	<0.001
SSN5	4.447	94	<0.001	4.346	82	<0.001	6.655	81	<0.001	4.488	81	<0.001	3.937	81	<0.001
SSN6	5.905	94	<0.001	3.943	82	<0.001	7.318	81	<0.001	4.414	81	<0.001	3.738	81	<0.001
SSN7	4.75	94	<0.001	4.148	82	<0.001	5.667	81	<0.001	4.017	81	<0.001	4.201	81	<0.001
SSN8	4.808	94	< 001	4.555	82	<0.001	5.044	81	<0.001	3.235	81	0.002	4.778	81	<0.001
Self-efficacy	3.121	49.69	0.003	2.718	51.50	0.009	2.707	48.19	0.009	2.724	51.45	0.009	2.087	81	0.040
Intention	3.838	55.44	<0.001	2.784	51.27	0.008	3.331	51.17	0.002	2.374	81	0.020	2.789	81	0.007
Behaviour	–	–	–	3.015	82	0.003	–	–	–	2.172	81	0.033	2.031	81	0.046

SSN, subjective social norm; SSN1, Outdoors they put on a mask if they cannot keep a safe distance away; SSN2, Indoors they keep a mask on in the presence of non-cohabitants; SSN3, They think that meeting with many people indoors is a risk; SSN4, They avoid crowded indoor places; SSN5, They wear masks when driving with non-cohabitants; SSN6, They avoid sitting indoors in bars, preferring to sit outdoors; SSN7, They make sure not to share a cup/bottle when they go out; SSN8, They make sure not to share a plate when going out.