Influencing factors, gender differences and the decomposition of inequalities in cognitive function in Chinese older adults: a population-based cohort study

Table 4 Results of Oaxaca-Blinder decomposition of gender differences in ICFCOA

Gender grouping	Model 1^a			Model 2^b
Gender grouping	IQ range	P-value	Percentage	IQ ratio	P-value	Percentage
Female group	9.706^**	≤ 0.001	—	3.009^**	≤ 0.001	—
Counterfactual group	8.709^**	≤ 0.001	—	2.437^**	≤ 0.001	—
Male group	8.140^**	≤ 0.001	—	2.212^**	≤ 0.001	—
Total gender difference	1.566^**	≤ 0.001	100.0%	0.797^**	≤ 0.001	100.0%
Total characteristic effect	0.569	0.064	36.3%	0.225^*	0.017	28.2%
Pure characteristic effect	1.065^**	0.003	68.0%	0.372^**	0.002	46.7%
Model specification error	-0.496	0.163	-31.7%	-0.147	0.188	-18.4%
Total coefficient effect	0.997^**	0.003	63.7%	0.572^**	≤ 0.001	71.8%
Pure coefficient effect	0.982^**	0.004	62.7%	0.555^**	≤ 0.001	69.6%
Reweighting error	0.015	0.906	1.0%	0.017	0.683	2.1%

ICFCOA, inequalities in cognitive function in Chinese older adults; IQ range, the 90-10th interquartile range; IQ ratio, the 90-10th interquartile ratio.
^a In Model 1, the IQ range was used as the explained variable.
^b In Model 2, the IQ ratio was used as the explained variable.
Standard errors and P-values for all models were obtained using bootstrap methods with 500 replications.
^*P < 0.05, ^**P < 0.01.

ISSN: 1471-2318