Inverse probability weighting and doubly robust methods in correcting the effects of non-response in the reimbursed medication and self-reported turnout estimates in the ATH survey

Table 5 The turnout percentages of the 2008 municipal election in different areas of Finland

	True results		Reported by respondents in ATH
Area	True^*	Self-reporting bias added^#	Crude^†	95% CI^§		Weighted^‡	95% CI^§
Continental Finland	61.3	70.7	78.2	(76.5	80.0)	72.9	(70.6	75.1)
Turku	58.6	68.8	77.3	(76.0	78.6)	72.9	(71.0	74.8)
Kainuu	53.7	65.2	71.9	(70.6	73.3)	68.5	(66.9	70.1)
Southern Oulu region	63.5	72.4	78.0	(75.8	80.3)	73.5	(70.8	76.1)
Oulu region	58.3	68.6	74.6	(72.8	76.5)	69.6	(67.3	71.8)

^*True turnout percent by the Election Unit at the Ministry of Justice of Finland.
^#Self-reporting bias added using Granberg and Holmberg [32]; 99% of the voters and 26% of the non-voters said that they voted.
^†Crude turnout percent.
^‡Weighted turnout percent.
^§95% confidence interval.

ISSN: 1471-2458