Table 1 Population-area scaling analysis results.

The yields (kg/maize per hectare) of the most productive agricultural strategies for the pre-Hispanic periods are as follows: Formative, 700; Classic and Toltec, 1400; and Aztec, 3000 (28). CI, confidence interval.

GroupSitesa (ha)95% CIα95% CIr2
Formative (1150 BCE to 150 CE)2300.1950.160–0.2380.7110.673–0.7490.855
Classic (150–650 CE)2720.2210.174–0.2790.6320.583–0.6810.707
Toltec (650–1200 CE)4840.2100.180–0.2440.7180.684–0.7530.777
Aztec (1200–1520 CE)5460.1770.156–0.2010.7640.734–0.7930.830
1960 Census1810.4450.250–0.9450.6410.0.552–0.7290.532
Amorphous (n < 5000)15100.237217–0.2590.6710.0.651–0.6910.741
Networked (n ≥ 5000)220.1090.009–1.3030.8530.598–0.1.1090.709