Respiratory	IRR	Lower bound	Upper bound	P values	Injuries	IRR	Lower bound	Upper bound	P values
Windows and doors	0.76	0.65	0.89	0.0007	Windows and doors	0.70	0.52	0.93	0.0152
Wall insulation	0.82	0.72	0.94	0.0042	Wall insulation	0.82	0.63	1.06	0.1293
Loft insulation	1.09	0.95	1.27	0.2246	Loft insulation	1.01	0.76	1.33	0.9694
Heating systems	0.93	0.81	1.07	0.2927	Heating systems	0.94	0.73	1.21	0.6480
Kitchens	1.11	0.87	1.43	0.3933	Kitchens	0.82	0.53	1.27	0.3699
Bathrooms	0.93	0.75	1.15	0.5099	Bathrooms	1.27	0.90	1.81	0.1778
Electrical systems	0.60	0.48	0.74	0.0000	Electrical systems	0.54	0.36	0.81	0.0030
Garden paths	0.74	0.63	0.87	0.0002	Garden paths	0.81	0.60	1.10	0.1786