Table 5.

T-test results of different types of building during different COVID periods.

Type	Period	t	df	p-value	Mean of differences (kWh/week)
Academic	Virtual campus	6.3348	56	<0.001***	3242.9
	Stage 1	6.9106	56	<0.001***	3923.7
	Stage 2	8.8958	56	<0.001***	2234.9
	Stage 3 (trimester 2)	7.5239	56	<0.001***	1667.7
	Stage 3 (trimester 3)	5.4216	56	<0.001***	1291.9
Administration	Virtual campus	1.9367	16	0.071	1285.2
	Stage 1	2.0775	16	0.054	1373.6
	Stage 2	1.8238	16	0.087	789.9
	Stage 3 (trimester 2)	2.1385	16	0.048*	749.8
	Stage 3 (trimester 3)	2.4138	16	0.028*	818.7
Infrastructure	Virtual campus	3.1755	9	0.011*	3757.1
	Stage 1	3.1325	9	0.012*	4497.0
	Stage 2	2.8977	9	0.018*	1976.2
	Stage 3 (trimester 2)	1.6643	9	0.13	1610.3
	Stage 3 (trimester 3)	2.6528	9	0.0264*	5761.1
Research	Virtual campus	−0.30888	6	0.7679	−252.7
	Stage 1	−1.2619	6	0.2538	−866.5
	Stage 2	1.6746	6	0.145	1081.2
	Stage 3 (trimester 2)	−0.18634	6	0.8583	−201.1
	Stage 3 (trimester 3)	−0.2648	6	0.8	−379.4
Residential	Virtual campus	3.5892	8	0.007**	1075.7
	Stage 1	2.917	8	0.019*	930.7
	Stage 2	4.166	8	0.003**	1492.9
	Stage 3 (trimester 2)	4.8043	8	0.001**	1444.1
	Stage 3 (trimester 3)	0.66425	8	0.525	833.0
Retail	Virtual campus	2.6393	5	0.046*	1156.6
	Stage 1	2.4504	5	0.058	1286.0
	Stage 2	2.3913	5	0.062	782.4
	Stage 3 (trimester 2)	2.3694	5	0.064	742.9
	Stage 3 (trimester 3)	3.1994	5	0.024*	766.8
Sport Recreation	Virtual campus	1.7802	5	0.135	1731.5
	Stage 1	1.5853	5	0.173	2328.4
	Stage 2	2.3844	5	0.063	631.0
	Stage 3 (trimester 2)	1.8113	5	0.1299	565.3
	Stage 3 (trimester 3)	1.4111	5	0.2173	658.1
Teaching	Virtual campus	3.4496	9	0.007**	828.4
	Stage 1	3.7771	9	0.004**	938.6
	Stage 2	2.9371	9	0.017*	1234.5
	Stage 3 (trimester 2)	2.6537	9	0.026*	928.0
	Stage 3 (trimester 3)	1.9841	9	0.079	1524.7

(***: p < 0.001; **: p < 0.01; *: p < 0.05).