. 2023 Apr 28;13:6950. doi: 10.1038/s41598-023-32180-9

Table 2.

Body plethysmography results of 40 subjects tested without mask (NM) and with three different mask types (SM, CM, FFP2) using the mask adapter.

	Measured results	Results of GLM model
VC (L)	4.67 2.74–7.30	4.67 2.79–7.39	4.74 2.69–7.34	4.66 2.80–7.33	4.62	− 0.1 0.165	− 0.1 0.311	− 0.1 0.274
FVC (L)	4.82 2.76–7.27	4.69 2.65–7.23	4.77 2.67–7.33	4.73 2.83–7.19	4.67	− 0.08 < 0.001	− 0.09 < 0.001	− 0.09 < 0.001
FEV₁ (L)	3.84 2.09–5.65	3.76 2.08–5.75	3.72 2.01–5.66	3.69 2.13–5.67	3.73	− 0.07 0.003	− 0.10 < 0.001	− 0.09 < 0.001
FEV₁/FVC (%)	79.79 65.13–93.24	78.45 65.00–93.24	77.81 62.01–92.82	77.33 63.79–92.72	79.39	− 0.39 0.227	− 0.92 0.005	− 0.90 0.006
PEF (L*s⁻¹)	8.77 4.59–12.75	8.32 4.34–13.21	7.93 4.46–11.65	7.94 4.08–11.52	8.36	− 0.27 0.037	− 0.54 < 0.001	− 0.63 < 0.001
MVV (L*min⁻¹)	115 63–170	113 62–173	111 60–170	111 64–170	111.78	− 1.93 0.003	− 2.82 < 0.001	− 2.61 < 0.001
Rtot (kPasL⁻¹)	0.15 0.07–0.28	0.19 0.04–0.34	0.21 0.03–0.33	0.28 0.07–0.44	0.14	0.05 < 0.001	0.06 < 0.001	0.11 < 0.001
sRtot (kPa*s)	0.5 0.3–1.4	0.7 0.3–1.7	0.8 0.4–1.5	1.0 0.2–2.2	0.64	− 0.20 < 0.001	0.28 < 0.001	0.50 < 0.001
WOB (kPa*L)	0.21 0.04–0.63	0.25 0.05–0.88	0.26 0.11–1.18	0.27 0.05–0.96	0.20	0.05 0.001	0.08 < 0.001	0.09 < 0.001
RP (Watt)	0.07 0.01–0.20	0.07 0.02–0.22	0.09 0.03–0.41	0.08 0.02–0.33	0.06	0.02 0.005	0.03 < 0.001	0.03 < 0.001
Ttot (s)	3.27 1.78–4.83	3.28 2.28–5.14	3.40 2.24–5.69	3.47 2.33–6.08	3.24	0.08 0.324	0.03 0.708	0.09 0.297

Measured results

Results of GLM model

NM
median
range

SM
median
range

CM
median
range

FFP2
median
range

NM
geometric mean

SM
Δ
p value

CM
Δ
p value

FFP2
Δ
p value

VC (L)

4.67

2.74–7.30

4.67

2.79–7.39

4.74

2.69–7.34

4.66

2.80–7.33

4.62

− 0.1

0.165

− 0.1

0.311

− 0.1

0.274

FVC (L)

4.82

2.76–7.27

4.69

2.65–7.23

4.77

2.67–7.33

4.73

2.83–7.19

4.67

− 0.08

< 0.001

− 0.09

< 0.001

− 0.09

< 0.001

FEV₁ (L)

3.84

2.09–5.65

3.76

2.08–5.75

3.72

2.01–5.66

3.69

2.13–5.67

3.73

− 0.07

0.003

− 0.10

< 0.001

− 0.09

< 0.001

FEV₁/FVC (%)

79.79

65.13–93.24

78.45

65.00–93.24

77.81

62.01–92.82

77.33

63.79–92.72

79.39

− 0.39

0.227

− 0.92

0.005

− 0.90

0.006

PEF (L*s⁻¹)

8.77

4.59–12.75

8.32

4.34–13.21

7.93

4.46–11.65

7.94

4.08–11.52

8.36

− 0.27

0.037

− 0.54

< 0.001

− 0.63

< 0.001

MVV (L*min⁻¹)

115

63–170

113

62–173

111

60–170

111

64–170

111.78

− 1.93

0.003

− 2.82

< 0.001

− 2.61

< 0.001

Rtot (kPa*s*L⁻¹)

0.15

0.07–0.28

0.19

0.04–0.34

0.21

0.03–0.33

0.28

0.07–0.44

0.14

0.05

< 0.001

0.06

< 0.001

0.11

< 0.001

sRtot (kPa*s)

0.5

0.3–1.4

0.7

0.3–1.7

0.8

0.4–1.5

1.0

0.2–2.2

0.64

− 0.20

< 0.001

0.28

< 0.001

0.50

< 0.001

WOB (kPa*L)

0.21

0.04–0.63

0.25

0.05–0.88

0.26

0.11–1.18

0.27

0.05–0.96

0.20

0.05

0.001

0.08

< 0.001

0.09

< 0.001

RP (Watt)

0.07

0.01–0.20

0.07

0.02–0.22

0.09

0.03–0.41

0.08

0.02–0.33

0.06

0.02

0.005

0.03

< 0.001

0.03

< 0.001

Ttot (s)

3.27

1.78–4.83

3.28

2.28–5.14

3.40

2.24–5.69

3.47

2.33–6.08

3.24

0.08

0.324

0.03

0.708

0.09

0.297

CM Community mask, Δ Difference to NM, FEV₁ Forced expiratory volume in 1 s, FEV1% VCMAX (%) Tiffeneau Index, FFP2 Filtering face piece class 2, FVC Forced vital capacity, MVV Maximum voluntary ventilation (FEV₁ *35), NM No mask, RP Respiratory power, Rtot Total airway resistance, SM Surgical mask, sRtot Specific airway resistance, PEF Peak expiratory flow, Ttot Inspiratory and expiratory time, VC Ventilation capacity, WOB Work of breathing, WOBin Inspiratory work of breathing, WOBex Expiratory work of breathing.

Presented are measured results (median, range). Differences (Δ) of NM to SM, CM, and FFP2 were analysed using a generalized linear mixed model (GLM).

Significant values are in bold.