Socioeconomic and demographic variables | Year | ||||
---|---|---|---|---|---|
1991–1993 (N = 6,221) | 1994–1996 (N = 6,312) | 1997–1999 (N = 5,255) | 2000–2004 (N = 5,965) | P-value* | |
Area of residence | P < 0.001 | ||||
Rural | 86.6% | 82.1% | 73.8% | 70.0% | |
Urban | 13.4% | 17.9% | 26.2% | 30.0% | |
Maternal education | P < 0.001 | ||||
No education | 56.5% | 52.4% | 44.3% | 35.8% | |
Primary | 28.2% | 28.4% | 29.0% | 31.1% | |
Secondary | 13.4% | 16.2% | 22.2% | 27.0% | |
Higher | 1.8% | 3.0% | 4.5% | 6.0% | |
Paternal education | P < 0.001 | ||||
No education | 47.4% | 46.0% | 42.0% | 38.2% | |
Primary | 24.8% | 25.7% | 25.3% | 26.8% | |
Secondary | 20.5% | 19.6% | 22.4% | 24.5% | |
Higher | 7.4% | 8.6% | 10.3% | 10.5% | |
Asset quintiles | P < 0.001 | ||||
Poorest | 27.6% | 21.6% | 17.4% | 10.2% | |
Poor | 24.5% | 22.4% | 19.2% | 15.9% | |
Middle | 19.5% | 19.2% | 18.6% | 22.5% | |
Richer | 15.1% | 19.0% | 21.7% | 24.9% | |
Richest | 13.3% | 17.8% | 23.2% | 26.5% | |
Age (years) | P < 0.001 | ||||
10–19 | 13.8% | 15.7% | 18.3% | 18.3% | |
20–24 | 33.0% | 30.8% | 31.1% | 34.2% | |
25–29 | 28.3% | 27.8% | 26.9% | 23.9% | |
30–34 | 13.8% | 15.6% | 14.7% | 14.5% | |
35–39 | 7.6% | 6.8% | 6.3% | 6.5% | |
40–49 | 3.5% | 3.3% | 2.8% | 2.6% | |
Parity | P < 0.001 | ||||
1 | 9.1% | 12.2% | 16.8% | 23.0% | |
2 | 18.6% | 22.6% | 25.8% | 26.8% | |
3 | 20.0% | 20.5% | 20.3% | 19.5% | |
4 | 16.4% | 15.1% | 13.7% | 12.9% | |
≥5 | 35.9% | 29.6% | 23.4% | 17.9% | |
Total | 100% | 100% | 100% | 100% |