Architects' Perceptions of LEED Indoor Environmental Quality Checklist Items on Employee Productivity

Figures & data

Table 1 Rank of the IEQ items from most associated with productivity to least associated with employee productivity (research question 1)

Rank	Mean	LEED item number	Item
1	4.37	16	Daylight and views, daylight for 75% of spaces
2	4.15	17	Daylight and views, views for 90% of spaces
3	4.00	14	Controllability of systems, perimeter
4	4.00	12	Thermal comfort, comply with ASHRAE 55-1992
5	3.98	4	Ventilation effectiveness
6	3.95	8	Low-emitting materials, paints
7	3.95	9	Low-emitting materials, carpet
8	3.85	7	Low-emitting materials, adhesives & sealants
9	3.81	15	Controllability of systems, non-perimeter
10	3.71	2	Environmental tobacco smoke control
11	3.53	1	Minimum IAQ performance
12	3.35	10	Low-emitting materials, composite wood
13	3.33	13	Thermal comfort, permanent monitoring system
14	3.29	11	Indoor chemical & pollutant source control
15	2.94	6	Construction IAQ management plan, before occupancy
16	2.87	3	Carbon dioxide monitoring
17	2.47	5	Construction IAQ management plan, during construction

Table 2 Rank of the IEQ items from greatest gain in employee productivity for the initial cost to least gain in employee productivity for the initial cost (research question 2)

Rank	Mean	LEED item number	Item
1	4.54	16	Daylight and views, daylight for 75% of spaces
2	4.25	9	Low-emitting materials, carpet
3	4.24	8	Low-emitting materials, paints
4	4.18	7	Low-emitting materials, adhesives & sealants
5	4.11	17	Daylight and views, views for 90% of spaces
6	4.09	1	Minimum IAQ performance
7	4.05	4	Ventilation effectiveness
8	3.96	2	Environmental tobacco smoke control
9	3.89	15	Thermal comfort, comply with ASHRAE 55-1992
10	3.85	12	Controllability of systems, perimeter
11	3.78	13	Controllability of systems, non-perimeter
12	3.74	10	Low-emitting materials, composite wood
13	3.61	11	Indoor chemical & pollutant source control
14	3.43	6	Construction IAQ management plan, before occupancy
15	3.19	14	Thermal comfort, permanent monitoring system
16	3.09	5	Construction IAQ management plan, during construction
17	2.74	3	Carbon dioxide monitoring

Figure 1 Quadrant analysis of IEQ data.