Appendix B - Predicted Normal Values

There is a vast literature of normal population studies, many of which have deficiencies in sample size, ethnicity, definition of normality, inclusion of smokers and choice of equipment. In the absence of population-specific reference values, measurements for patients of mainly European origin are better predicted by European values while those for patients of mainly British and Irish origin are better predicted by North American values.

The following tables provide mean predicted values for Caucasians of both sexes for FEV₁, FVC, FEV₁/FVC, FEF_25–75% and PEF. The tables are based on a large and well-conducted study in asymptomatic, lifelong non-smokers aged 8 to 80 years who participated in the National Health and Nutrition Examination Survey (NHANES III).^2,3 It is not recommended to extrapolate beyond the age and height range of the population used to obtain the reference equations.

Age is shown in years, height is shown in centimetres.

Respiratory function tables

From the National Asthma Council Australia. Asthma Management Handbook 2006. Melbourne: National Asthma Council Australia, 2006. Used with permission.

FEV₁ (L) Male

Age		20	25	30	35	40	45	50	55	60	65	70	75	80
	145 cm	3.19	3.08	2.97	2.85	2.72	2.58	2.44	2.28	2.12	1.94	1.76	1.57	1.37
	150 cm	3.40	3.29	3.18	3.06	2.93	2.79	2.64	2.49	2.32	2.15	1.97	1.78	1.58
	155 cm	3.61	3.51	3.39	3.27	3.14	3.01	2.86	2.70	2.54	2.37	2.19	2.00	1.80
	160 cm	3.83	3.73	3.62	3.50	3.37	3.23	3.08	2.93	2.76	2.59	2.41	2.22	2.02
	165 cm	4.06	3.96	3.85	3.73	3.60	3.46	3.31	3.15	2.99	2.82	2.64	2.45	2.25
	170 cm	4.30	4.19	4.08	3.96	3.83	3.69	3.55	3.39	3.23	3.05	2.87	2.68	2.48
	175 cm	4.54	4.44	4.33	4.20	4.07	3.94	3.79	3.63	3.47	3.30	3.12	2.93	2.73
	180 cm	4.79	4.69	4.58	4.45	4.32	4.19	4.04	3.88	3.72	3.55	3.37	3.18	2.98
	185 cm	5.05	4.95	4.83	4.71	4.58	4.44	4.30	4.14	3.98	3.80	3.62	3.43	3.24
	190 cm	5.31	5.21	5.10	4.98	4.85	4.71	4.56	4.41	4.24	4.07	3.89	3.70	3.50
	195 cm	5.58	5.48	5.37	5.25	5.12	4.98	4.83	4.68	4.51	4.34	4.16	3.97	3.77

FVC (L) Male

Age		20	25	30	35	40	45	50	55	60	65	70	75	80
	145 cm	3.63	3.57	3.50	3.42	3.32	3.21	3.09	2.95	2.80	2.63	2.45	2.26	2.06
	150 cm	3.91	3.85	3.78	3.69	3.60	3.49	3.36	3.22	3.07	2.91	2.73	2.54	2.33
	155 cm	4.19	4.13	4.06	3.98	3.88	3.77	3.64	3.51	3.36	3.19	3.01	2.82	2.62
	160 cm	4.48	4.43	4.36	4.27	4.17	4.06	3.94	3.80	3.65	3.48	3.31	3.11	2.91
	165 cm	4.79	4.73	4.66	4.57	4.48	4.37	4.24	4.10	3.95	3.79	3.61	3.42	3.21
	170 cm	5.10	5.04	4.97	4.89	4.79	4.68	4.55	4.42	4.26	4.10	3.92	3.73	3.52
	175 cm	5.42	5.36	5.29	5.21	5.11	5.00	4.88	4.74	4.59	4.42	4.24	4.05	3.85
	180 cm	5.75	5.69	5.62	5.54	5.44	5.33	5.21	5.07	4.92	4.75	4.57	4.38	4.18
	185 cm	6.09	6.03	5.96	5.88	5.78	5.67	5.55	5.41	5.26	5.09	4.91	4.72	4.52
	190 cm	6.44	6.38	6.31	6.23	6.13	6.02	5.90	5.76	5.61	5.44	5.26	5.07	4.87
	195 cm	6.80	6.74	6.67	6.59	6.49	6.38	6.25	6.12	5.97	5.80	5.62	5.43	5.22

FEV₁/FVC (%) Male

Age	20	25	30	35	40	45	50	55	60	65	70	75	80
All Heights	83.9	82.9	81.9	80.8	79.8	78.8	77.7	76.7	75.7	74.6	73.6	72.6	71.5

FEV₁(L) Female

Age		18	20	25	30	35	40	45	50	55	60	65	70	75	80
	145 cm	2.72	2.70	2.64	2.57	2.49	2.40	2.30	2.18	2.06	1.94	1.80	1.65	1.49	1.32
	150 cm	2.89	2.87	2.81	2.74	2.66	2.57	2.46	2.35	2.23	2.10	1.97	1.82	1.66	1.49
	155 cm	3.07	3.05	2.98	2.91	2.83	2.74	2.64	2.53	2.41	2.28	2.14	1.99	1.83	1.66
	160 cm	3.25	3.23	3.16	3.09	3.01	2.92	2.82	2.71	2.59	2.46	2.32	2.17	2.01	1.85
	165 cm	3.44	3.41	3.35	3.28	3.20	3.11	3.01	2.90	2.78	2.65	2.51	2.36	2.20	2.03
	170 cm	3.63	3.61	3.54	3.47	3.39	3.30	3.20	3.09	2.97	2.84	2.70	2.55	2.39	2.23
	175 cm	3.83	3.80	3.74	3.67	3.59	3.50	3.40	3.29	3.17	3.04	2.90	2.75	2.59	2.42
	180 cm	4.03	4.01	3.95	3.88	3.79	3.70	3.60	3.49	3.37	3.24	3.10	2.95	2.80	2.63
	185 cm	4.24	4.22	4.16	4.08	4.00	3.91	3.81	3.70	3.58	3.45	3.31	3.16	3.01	2.84
	190 cm	4.46	4.43	4.37	4.30	4.22	4.13	4.03	3.92	3.80	3.67	3.53	3.38	3.22	3.05
	195 cm	4.68	4.65	4.59	4.52	4.44	4.35	4.25	4.14	4.02	3.89	3.75	3.60	3.44	3.27

FVC (L) Female

Age		18	20	25	30	35	40	45	50	55	60	65	70	75	80
	145 cm	2.97	2.98	2.99	2.98	2.95	2.90	2.83	2.74	2.63	2.51	2.36	2.20	2.01	1.81
	150 cm	3.19	3.20	3.21	3.19	3.16	3.11	3.05	2.96	2.85	2.72	2.58	2.41	2.23	2.03
	155 cm	3.42	3.42	3.43	3.42	3.39	3.34	3.27	3.18	3.08	2.95	2.80	2.64	2.46	2.25
	160 cm	3.65	3.66	3.67	3.65	3.62	3.57	3.50	3.42	3.31	3.18	3.04	2.87	2.69	2.49
	165 cm	3.89	3.90	3.91	3.89	3.86	3.81	3.75	3.66	3.55	3.42	3.28	3.11	2.93	2.73
	170 cm	4.14	4.15	4.15	4.14	4.11	4.06	3.99	3.91	3.80	3.67	3.53	3.36	3.18	2.98
	175 cm	4.39	4.40	4.41	4.40	4.37	4.32	4.25	4.16	4.05	3.93	3.78	3.62	3.43	3.23
	180 cm	4.66	4.67	4.67	4.66	4.63	4.58	4.51	4.42	4.32	4.19	4.05	3.88	3.70	3.50
	185 cm	4.93	4.94	4.94	4.93	4.90	4.85	4.78	4.69	4.59	4.46	4.32	4.15	3.97	3.77
	190 cm	5.21	5.21	5.22	5.21	5.18	5.13	5.06	4.97	4.87	4.74	4.59	4.43	4.25	4.04
	195 cm	5.49	5.50	5.51	5.49	5.46	5.41	5.35	5.26	5.15	5.02	4.88	4.71	4.53	4.33

FEV₁/FVC (%) Female

Age	18	20	25	30	35	40	45	50	55	60	65	70	75	80
All Heights	87.0	86.6	85.5	84.4	83.4	82.3	81.2	80.2	79.1	78.1	77.0	75.9	74.9	73.8

FEV₁ (L) Male children (<20 years)

Age		8	10	12	14	16	18	20
	125 cm	1.42	1.49	1.61	1.76	1.95	2.17	2.43
	130 cm	1.60	1.67	1.79	1.94	2.13	2.35	2.61
	135 cm	1.78	1.86	1.98	2.13	2.31	2.54	2.79
	140 cm	1.98	2.06	2.17	2.32	2.51	2.73	2.99
	145 cm	2.18	2.26	2.37	2.52	2.71	2.93	3.19
	150 cm	2.38	2.46	2.58	2.73	2.92	3.14	3.40
	155 cm	2.60	2.68	2.79	2.94	3.13	3.35	3.61
	160 cm	2.82	2.90	3.02	3.17	3.35	3.58	3.83
	165 cm	3.05	3.13	3.24	3.40	3.58	3.80	4.06
	170 cm	3.29	3.37	3.48	3.63	3.82	4.04	4.30
	175 cm	3.53	3.61	3.72	3.87	4.06	4.28	4.54
	180 cm	3.78	3.86	3.97	4.13	4.31	4.53	4.79
	185 cm	4.04	4.12	4.23	4.38	4.57	4.79	5.05

FVC(L) Male children (<20 years)

Age		8	10	12	14	16	18	20
	125 cm	1.67	1.63	1.66	1.78	1.98	2.26	2.62
	130 cm	1.91	1.86	1.90	2.02	2.22	2.50	2.86
	135 cm	2.15	2.11	2.15	2.27	2.47	2.75	3.11
	140 cm	2.41	2.37	2.40	2.52	2.72	3.00	3.37
	145 cm	2.68	2.63	2.67	2.79	2.99	3.27	3.63
	150 cm	2.95	2.91	2.95	3.06	3.26	3.54	3.91
	155 cm	3.24	3.19	3.23	3.35	3.55	3.83	4.19
	160 cm	3.53	3.49	3.52	3.64	3.84	4.12	4.48
	165 cm	3.83	3.79	3.83	3.94	4.14	4.43	4.79
	170 cm	4.14	4.10	4.14	4.26	4.46	4.74	5.10
	175 cm	4.47	4.42

Appendix B - Predicted Normal Values

Respiratory function tables

FEV1 (L) Male

FVC (L) Male

FEV1/FVC (%) Male

FEV1 (L) Female