Table 2.

For each country, the factors related to maternal mental health according to the top three regression models identified through cross-validation

Independent variables	Italy			Netherlands			China
Model ranking	1	2	3	1	2	3	1	2	3
Number of winsa	20%	15%	12%	49%	25%	9%	21%	19%	18%
Married							x	x	x
Number of children						x	x	x	x
Age youngest child
Mother's age	x	x	x
Mother's education				x	x	x	x	x	x
Family income		x	x				x	x	x
Mother's job				x	x	x		x	x
Pandemic-related life stress mother	x	x	x	x	x	x	x	x	x
Pandemic-related work stress mother	x	x	x	x	x	x	x	x	x
Resilience	x	x	x	x	x	x	x	x	x
Mother's poor physical health	x	x	x				x		x
Family conflict	x	x	x	x	x	x	x	x	x
Father's involvement	x	x	x
Grandparents childcare							x	x	x
Grandparents childcare* Age of the youngest child		x			x

^aThis indicates the percentage of the 200 cross-validation repeats a particular model showed the lowest prediction error (RMSE) of all 32 768 investigated models.