| Study: population () | | % |
| Study 1: informal workers (1,458) | | | Sex | | | Female | 728 | 49.9 | Age group | | | <30 years | 537 | 36.8 | 30 to 45 years | 553 | 37.9 | >45 years | 368 | 25.2 | Education level (1,438) | | | Elementary | 1,379 | 95.9 | Technical/tertiary | 9 | 0.6 | Without qualification | 50 | 3.5 |
| Study 2: teachers (4,496) | | | Sex (4,342) | | | Female | 3,994 | 92.0 | Age group (4,302) | | | <30 years | 773 | 18.0 | 30 to 45 years | 2,289 | 53.2 | >45 years | 1,240 | 28.8 | Education level (4,398) | | | Elementary | 717 | 16.3 | Technical/tertiary | 3,609 | 82.1 | Postgraduate | 72 | 1.6 |
| Study 3: healthcare workers (2,448) | | | Sex (2,421) | | | Female | 1,951 | 80.6 | Age group (2,395) | | | <30 years | 581 | 24.3 | 30 to 45 years | 1,071 | 44.7 | >45 years | 743 | 31.0 | Education level (2,419) | | | Elementary | 1,038 | 42.9 | Technical/tertiary | 1,000 | 41.3 | Postgraduate | 381 | 15.8 |
| Study 4: urban workers (1,557) | | | Sex (1,557) | | | Female | 851 | 54.7 | Age group (1,557) | | | <30 years | 576 | 37.0 | 30 to 45 years | 584 | 37.5 | >45 years | 397 | 25.5 | Education level (1,269) | | | Elementary | 536 | 42.3 | Technical/tertiary | 710 | 55.9 | Without qualification | 23 | 1.8 |
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