. 2022 Feb 9;130(2):027005. doi: 10.1289/EHP9563

Table 1.

Sample characteristics at baseline assessment (2001–2003) for the total sample ( $uppercase italic n equals 2468$ ) and by air pollutant quartiles of $particulate matter begin subscript 2.5 end subscript$ and ${NO}_{x}$ . Participants are from the SNAC-K Study on Aging and Care in Kungsholmen, Stockholm, Sweden.

	Total sample ( $lowercase italic n equals 2468$ )		$particulate matter begin subscript 2.5 end subscript$ quartiles				${NO}_{x}$ quartiles
	$n$		1st $uppercase italic n equals 617$	2nd $uppercase italic n equals 617$	3rd $uppercase italic n equals 617$	4th $uppercase italic n equals 617$	1st $uppercase italic n equals 617$	2nd $uppercase italic n equals 617$	3rd $uppercase italic n equals 617$	4th $uppercase italic n equals 617$
Age ( $mean \pm SD$ )	2,468	$72.3 \pm 9.9$	$70.4 \pm 9.4$	$72.2 \pm 9.8$	$\begin{matrix} 73.5 \pm 10.3 \end{matrix}$	$72.9 \pm 10.0$	$69.7 \pm 9.2$	$72.6 \pm 9.8$	$73.8 \pm 10.0$	$73.1 \pm 10.2$
Female/male (%)	2,468	61.0/39.0	55.6/44.4	62.9/37.1	61.4/38.6	64.2/35.8	56.1/43.9	61.8/38.3	62.6/37.4	63.7/36.3
Years of education ( $mean \pm SD$ )	2,468	$12.2 \pm 4.2$	$12.6 \pm 4.1$	$12.4 \pm 4.4$	$12.0 \pm 4.2$	$11.9 \pm 4.1$	$12.7 \pm 4.2$	$12.2 \pm 4.3$	$12.1 \pm 4.4$	$11.9 \pm 4.0$
Vocabulary ( $mean \pm SD$ )	2,448	$22.8 \pm 5.1$	$23.2 \pm 4.8$	$22.8 \pm 5.2$	$22.9 \pm 4.9$	$22.5 \pm 5.3$	$23.4 \pm 4.6$	$22.7 \pm 5.3$	$23.0 \pm 5.0$	$22.4 \pm 5.3$
Blue-collar/white-collar profession (%)	2,465	20.1/79.8	16.4/83.6	19.5/80.6	21.2/78.4	23.3/76.5	14.9/85.1	20.9/78.9	20.4/79.4	24.2/75.7
BMI ( $mean \pm SD$ )	2,419	$25.8 \pm 4.1$	$26.0 \pm 3.9$	$25.8 \pm 4.1$	$25.7 \pm 4.1$	$25.8 \pm 4.2$	$25.9 \pm 3.9$	$26.0 \pm 4.3$	$25.6 \pm 3.7$	$25.7 \pm 4.4$
Smoking yes/no (%)
Currently	363	14.7/85.3	12.3/87.7	15.7/84.3	14.4/85.6	16.4/83.6	13.1/86.9	12.6/87.4	16.7/83.3	16.4/83.6
Ever	973	39.4/60.6	40.0/60.0	40.0/60.0	41.3/58.7	36.3/63.7	40.4/59.6	41.2/58.8	40.0/60.0	36.1/63.9
Never	1,118	45.3/54.7	47.5/52.5	43.8/56.2	42.9/57.1	46.5/53.5	46.4/53.6	45.1/54.9	43.1/56.9	46.7/53.3
Diabetes yes/no (%)	2,468	8.6/91.4	7.9/92.1	8.8/91.3	9.1/90.9	8.6/91.4	6.2/93.8	11.0/89.0	8.3/91.7	8.9/91.1
Heart disease yes/no (%)	2,468	20.8/79.2	19.9/80.1	19.8/80.2	20.8/79.3	22.7/77.3	16.2/83.8	22.2/77.8	22.5/77.5	22.2/77.8
Cerebrovascular disease yes/no (%)	2,468	5.8/94.3	4.2/95.8	5.0/95.0	6.8/93.2	7.0/93.0	4.1/95.9	5.4/94.6	6.3/93.7	7.3/92.7
$particulate matter begin subscript 2.5 end subscript$ ( $mean \pm SD$ ; $microgram per meter cubed])$ )	2,468	$8.4 \pm 0.7$	$7.7 \pm 0.2$	$8.1 \pm 0.1$	$8.4 \pm 0.1$	$9.3 \pm 0.8$	$7.7 \pm 0.3$	$8.1 \pm 0.2$	$8.4 \pm 0.2$	$9.2 \pm 0.8$
${NO}_{x}$ ( $mean \pm SD$ ; ${μ g / m}^{3}$ )	2,468	$33.5 \pm 12.0$	$23.2 \pm 3.7$	$29.8 \pm 3.0$	$33.7 \pm 3.1$	$47.3 \pm 15.2$	$22.5 \pm 3.1$	$29.6 \pm 1.5$	$34.1 \pm 1.4$	$47.9 \pm 14.8$
Odor identification score ( $mean \pm SD$ )	2,468	$11.6 \pm 3.1$	$11.8 \pm 3.1$	$11.6 \pm 3.0$	$11.5 \pm 3.4$	$11.6 \pm 3.0$	$11.9 \pm 3.0$	$11.6 \pm 3.1$	$11.5 \pm 3.2$	$11.6 \pm 3.1$

Note: Variables with missing values: Smoking $lowercase italic n equals 14$ ; Occupational background $lowercase italic n equals 3$ . BMI, body mass index; ${NO}_{x}$ , nitrogen oxide; $particulate matter begin subscript 2.5 end subscript$ , particulate matter with aerodynamic diameter less than or equal to $2.5 micrograms$ ; SD, standard deviation.