Table 2 One-vs.- two-rescuer method in a confined (top) vs. open space (bottom).

Parameter in a confined space	Method	Minute of BLS					ANOVA (p-values)
Parameter in a confined space	Method	Minute 0–2	Minute 2–4	Minute 4–6	Minute 6–8	Minute 8–10	Timepoint	Condition	Interaction
Ventilation (number/min)	One-rescuer-method	4.43	4.63	4.65	4.83	4.63	< 0.001	< 0.001	< 0.001
Ventilation (number/min)	Two-rescuer-method	5.45	6.10	6.00	6.30	5.85	< 0.001	< 0.001	< 0.001
Breathing volume (l/breath)	One-rescuer-method	0.38	0.40	0.40	0.40	0.40	0.2123	0.1261	0.1789
Breathing volume (l/breath)	Two-rescuer-method	0.41	0.40	0.41	0.40	0.39	0.2123	0.1261	0.1789
No-Flow-Time (sec/min)	One-rescuer-method	7.82	8.23	8.17	8.07	7.95	< 0.001	< 0.001	< 0.001
No-Flow-Time (sec/min)	Two-rescuer-method	22.60	25.18	24	25.13	24.33	< 0.001	< 0.001	< 0.001
Compression rate (number/min)	One-rescuer-method	121.15	118.30	118.05	117.25	118	0.0431	0.0336	0.0213
Compression rate (number/min)	Two-rescuer-method	120.70	121.90	121.90	119.50	121.20	0.0431	0.0336	0.0213
Compression depth (mm/compression)	One-rescuer-method	61,85	60.16	60.79	60.70	60.18	0.0234	0.0307	0.0301
Compression depth (mm/compression)	Two-rescuer-method	59.84	59.92	58.14	59.93	58.83	0.0234	0.0307	0.0301
Missing releases (total number/10min)	One-rescuer-method	36.35	23.65	24.50	22.85	28.10	< 0.001	< 0.001	< 0.001
Missing releases (total number/10min)	Two-rescuer-method	44.90	41.30	34.30	56.90	55.80	< 0.001	< 0.001	< 0.001

Parameter in open space	Method	Minute of BLS					ANOVA (p-values)
Parameter in open space	Method	Minute 0–2	Minute 2–4	Minute 4–6	Minute 6–8	Minute 8–10	Timepoint	Condition	Interaction
Ventilation (number/min)	One-rescuer-method	4.60	4.93	4.70	5.10	5.00	0.0088	0.0336	0.1112
Ventilation (number/min)	Two-rescuer-method	5.85	6.85	6.60	5.85	5.65	0.0088	0.0336	0.1112
Breathing volume (l/breath)	One-rescuer-method	0.41	0.4	0.4	0.4	0.41	0.4138	0.0459	0.0918
Breathing volume (l/breath)	Two-rescuer-method	0.38	0.42	0.41	0.4	0.42	0.4138	0.0459	0.0918
No-Flow-Time (sec/min)	One-rescuer-method	7.52	7.48	7.52	7.5	7.51	< 0.001	< 0.001	< 0.001
No-Flow-Time (sec/min)	Two-rescuer-method	21.3	21.04	21.26	22.03	20.93	< 0.001	< 0.001	< 0.001
Compression rate (number/min)	One-rescuer-method	123	121	121.8	120.4	120.1	0.3827	0.4186	0.4750
Compression rate (number/min)	Two-rescuer-method	122.2	121.2	120.9	120.8	120.7	0.3827	0.4186	0.4750
Compression depth (mm/compression)	One-rescuer-method	62.09	61.31	60.53	60.05	59.87	0.0778	0.1729	0.3680
Compression depth (mm/compression)	Two-rescuer-method	59.39	58.57	59.75	58.8	61.04	0.0778	0.1729	0.3680
Missing releases (total number/10min)	One-rescuer-method	30.25	25.85	24.85	25.35	29.15	< 0.001	< 0.001	< 0.001
Missing releases (total number/10min)	Two-rescuer-method	53.5	43.1	36	40.8	43.4	< 0.001	< 0.001	< 0.001

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