Table 1.

Procedure groups

1	Airway suctioning
2	Autopsy
3	Breaking closed ventilation systems (intentionally or unintentionally)
4	Bronchoscopy
5	Cardiopulmonary resuscitation
6	Chest physiotherapy
7	Colonoscopy
8	Coughing
9	ENT and neurosurgery
10	Nitrous oxide (Entonox) administration
11	GI endoscopy (not further specified)
12	Handling soiled laundry
13	High-frequency oscillatory ventilation
14	High-flow oxygen therapy
15	Intra/extra pulmonary high-frequency oscillation devices
16	Intubation and extubation procedures
17	Labour and delivery
18	Lung function testing
19	Manipulation of masks
20	Manual ventilation
21	Mechanical ventilation
22	Mechanical insufflation and exsufflation
23	Nasogastric tube insertion
24	Nasopharyngeal aspirate
25	Nasopharyngeal and oropharyngeal swabbing
26	Nasopharyngoscopy or laryngoscopy
27	Nebulised or aerosol therapy
28	Non-invasive ventilation
29	Oral and dental procedures
30	Prone positioning
31	Sputum induction
32	Suction of body fluids (not further specified)
33	Supraglottic airways
34	Surgery/postmortem procedures with high-speed devices
35	Thoracic surgery and procedures
36	Toilet use and flushing
37	Tracheostomy and tracheostomy procedures
38	Upper GI endoscopy
39	Vacuum cleaning

ENT, ear, nose and throat; GI, gastrointestinal.