European Transport Research Review

An Open Access Journal

Table 1 Demographic characteristics of the sample

From: Analyzing the moderating effects of respondent type and experience on the fuel efficiency improvement in air transport using structural equation modeling

Demographic categories	Frequency	Percentage (%)
Gender
Male	288	77
Female	87	23
Age (years)
24–34	126	34
35–44	97	26
45–54	65	17
55 and above	87	23
Education level
Graduation	102	27
Masters	129	34
Ph.D or Doctorate	144	38
Industry type
Academics	166	44
Aviation	209	56
Experience level
3–15	159	42
16–30	131	35
31 and above	85	23
Occupation
Directors	39	10
Managers	63	17
Research scientists	96	26
Aircrafts pilots	11	3
Professor	37	10
Associate professors	48	13
Assistant professors	55	15
Lecturer	14	4
Senior lecturer	12	3

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