Sex	Level of studies	Frequency	Total
Both sexes	Total	Total	100.00
Both sexes	Total	Never or almost never	84.42
Both sexes	Total	Less than one hour a day	4.69
Both sexes	Total	One to five hours a day	3.42
Both sexes	Total	More than 5 hours a day	3.30
Both sexes	Total	Not applicable (does not work in an enclosed space)	4.17
Both sexes	Cannot read or write, or incomplete primary education	Total	100.00
Both sexes	Cannot read or write, or incomplete primary education	Never or almost never	77.85
Both sexes	Cannot read or write, or incomplete primary education	Less than one hour a day	2.73
Both sexes	Cannot read or write, or incomplete primary education	One to five hours a day	2.52
Both sexes	Cannot read or write, or incomplete primary education	More than 5 hours a day	3.29
Both sexes	Cannot read or write, or incomplete primary education	Not applicable (does not work in an enclosed space)	13.60
Both sexes	Complete primary education	Total	100.00
Both sexes	Complete primary education	Never or almost never	78.76
Both sexes	Complete primary education	Less than one hour a day	4.89
Both sexes	Complete primary education	One to five hours a day	3.81
Both sexes	Complete primary education	More than 5 hours a day	4.20
Both sexes	Complete primary education	Not applicable (does not work in an enclosed space)	8.34
Both sexes	Secondary education, 1st stage	Total	100.00
Both sexes	Secondary education, 1st stage	Never or almost never	79.98
Both sexes	Secondary education, 1st stage	Less than one hour a day	6.25
Both sexes	Secondary education, 1st stage	One to five hours a day	4.17
Both sexes	Secondary education, 1st stage	More than 5 hours a day	4.88
Both sexes	Secondary education, 1st stage	Not applicable (does not work in an enclosed space)	4.73
Both sexes	Secondary education, 2nd stage	Total	100.00
Both sexes	Secondary education, 2nd stage	Never or almost never	84.80
Both sexes	Secondary education, 2nd stage	Less than one hour a day	3.95
Both sexes	Secondary education, 2nd stage	One to five hours a day	3.27
Both sexes	Secondary education, 2nd stage	More than 5 hours a day	4.12
Both sexes	Secondary education, 2nd stage	Not applicable (does not work in an enclosed space)	3.86
Both sexes	Advanced professional training or the equivalent	Total	100.00
Both sexes	Advanced professional training or the equivalent	Never or almost never	86.21
Both sexes	Advanced professional training or the equivalent	Less than one hour a day	5.50
Both sexes	Advanced professional training or the equivalent	One to five hours a day	4.46
Both sexes	Advanced professional training or the equivalent	More than 5 hours a day	2.55
Both sexes	Advanced professional training or the equivalent	Not applicable (does not work in an enclosed space)	1.27
Both sexes	University education	Total	100.00
Both sexes	University education	Never or almost never	90.81
Both sexes	University education	Less than one hour a day	4.24
Both sexes	University education	One to five hours a day	2.60
Both sexes	University education	More than 5 hours a day	1.08
Both sexes	University education	Not applicable (does not work in an enclosed space)	1.27
Male	Total	Total	100.00
Male	Total	Never or almost never	80.33
Male	Total	Less than one hour a day	5.65
Male	Total	One to five hours a day	4.09
Male	Total	More than 5 hours a day	3.75
Male	Total	Not applicable (does not work in an enclosed space)	6.18
Male	Cannot read or write, or incomplete primary education	Total	100.00
Male	Cannot read or write, or incomplete primary education	Never or almost never	70.59
Male	Cannot read or write, or incomplete primary education	Less than one hour a day	3.04
Male	Cannot read or write, or incomplete primary education	One to five hours a day	2.36
Male	Cannot read or write, or incomplete primary education	More than 5 hours a day	3.65
Male	Cannot read or write, or incomplete primary education	Not applicable (does not work in an enclosed space)	20.35
Male	Complete primary education	Total	100.00
Male	Complete primary education	Never or almost never	74.46
Male	Complete primary education	Less than one hour a day	5.49
Male	Complete primary education	One to five hours a day	4.38
Male	Complete primary education	More than 5 hours a day	4.52
Male	Complete primary education	Not applicable (does not work in an enclosed space)	11.14
Male	Secondary education, 1st stage	Total	100.00
Male	Secondary education, 1st stage	Never or almost never	76.38
Male	Secondary education, 1st stage	Less than one hour a day	7.24
Male	Secondary education, 1st stage	One to five hours a day	4.79
Male	Secondary education, 1st stage	More than 5 hours a day	4.51
Male	Secondary education, 1st stage	Not applicable (does not work in an enclosed space)	7.09
Male	Secondary education, 2nd stage	Total	100.00
Male	Secondary education, 2nd stage	Never or almost never	80.25
Male	Secondary education, 2nd stage	Less than one hour a day	5.20
Male	Secondary education, 2nd stage	One to five hours a day	4.11
Male	Secondary education, 2nd stage	More than 5 hours a day	5.07
Male	Secondary education, 2nd stage	Not applicable (does not work in an enclosed space)	5.37
Male	Advanced professional training or the equivalent	Total	100.00
Male	Advanced professional training or the equivalent	Never or almost never	83.60
Male	Advanced professional training or the equivalent	Less than one hour a day	7.18
Male	Advanced professional training or the equivalent	One to five hours a day	5.00
Male	Advanced professional training or the equivalent	More than 5 hours a day	2.20
Male	Advanced professional training or the equivalent	Not applicable (does not work in an enclosed space)	2.01
Male	University education	Total	100.00
Male	University education	Never or almost never	89.05
Male	University education	Less than one hour a day	4.79
Male	University education	One to five hours a day	3.14
Male	University education	More than 5 hours a day	1.56
Male	University education	Not applicable (does not work in an enclosed space)	1.45
Female	Total	Total	100.00
Female	Total	Never or almost never	89.70
Female	Total	Less than one hour a day	3.45
Female	Total	One to five hours a day	2.56
Female	Total	More than 5 hours a day	2.71
Female	Total	Not applicable (does not work in an enclosed space)	1.58
Female	Cannot read or write, or incomplete primary education	Total	100.00
Female	Cannot read or write, or incomplete primary education	Never or almost never	89.94
Female	Cannot read or write, or incomplete primary education	Less than one hour a day	2.22
Female	Cannot read or write, or incomplete primary education	One to five hours a day	2.79
Female	Cannot read or write, or incomplete primary education	More than 5 hours a day	2.70
Female	Cannot read or write, or incomplete primary education	Not applicable (does not work in an enclosed space)	2.36
Female	Complete primary education	Total	100.00
Female	Complete primary education	Never or almost never	86.84
Female	Complete primary education	Less than one hour a day	3.76
Female	Complete primary education	One to five hours a day	2.74
Female	Complete primary education	More than 5 hours a day	3.60
Female	Complete primary education	Not applicable (does not work in an enclosed space)	3.06
Female	Secondary education, 1st stage	Total	100.00
Female	Secondary education, 1st stage	Never or almost never	85.59
Female	Secondary education, 1st stage	Less than one hour a day	4.72
Female	Secondary education, 1st stage	One to five hours a day	3.19
Female	Secondary education, 1st stage	More than 5 hours a day	5.45
Female	Secondary education, 1st stage	Not applicable (does not work in an enclosed space)	1.05
Female	Secondary education, 2nd stage	Total	100.00
Female	Secondary education, 2nd stage	Never or almost never	90.26
Female	Secondary education, 2nd stage	Less than one hour a day	2.44
Female	Secondary education, 2nd stage	One to five hours a day	2.27
Female	Secondary education, 2nd stage	More than 5 hours a day	2.98
Female	Secondary education, 2nd stage	Not applicable (does not work in an enclosed space)	2.05
Female	Advanced professional training or the equivalent	Total	100.00
Female	Advanced professional training or the equivalent	Never or almost never	89.83
Female	Advanced professional training or the equivalent	Less than one hour a day	3.19
Female	Advanced professional training or the equivalent	One to five hours a day	3.71
Female	Advanced professional training or the equivalent	More than 5 hours a day	3.03
Female	Advanced professional training or the equivalent	Not applicable (does not work in an enclosed space)	0.24
Female	University education	Total	100.00
Female	University education	Never or almost never	92.42
Female	University education	Less than one hour a day	3.74
Female	University education	One to five hours a day	2.10
Female	University education	More than 5 hours a day	0.64
Female	University education	Not applicable (does not work in an enclosed space)	1.10