Spatial tick bite exposure and associated risk factors in Scandinavia

Figures & data

Table 1. Gender distribution.

Gender	Norway	Denmark	Sweden	Total
Women	406 (51.4%)	420 (53.6%)	577 (52.6.%)	1403 (52.6%)
Men	380 (48.2%)	361 (46.2%)	514 (46.9%)	1255 (47.0%)
Other	0 (0%)	1 (0.1%)	2 (0.2%)	3 (0.1%)
No answer	3 (0.4%)	1 (0.1%)	3 (0.3%)	7 (0.3%)

Table 2. Level of education.

Education	Norway	Denmark	Sweden	Total
Not finished primary school	1 (0.1%)	3 (0.4%)	1 (0.1%)	5 (0.2%)
Primary school	19 (2.4%)	57 (7.3%)	73 (6.7%)	149 (5.6%)
Secondary School	212 (26.9%)	114 (14.6%)	339 (30.9%)	665 (24.9%)
University/High School 1-3 years	198 (25.1%)	249 (31.8%)	283 (25.8%)	730 (27.4%)
University/High School more than 3 years	329 (41.7%)	329 (42.0%)	345 (31.5%)	1003 (37.6%)
PhD	20 (2.5%)	10 (1.3%)	34 (3.1%)	64 (2.4%)
Does not want to answer	10 (1.3%)	21 (2.6%)	21 (1.9%)	52 (1.9%)
Total	789	783	1096	2668

Table 3. The age of the respondents.

Age group	Norway	Denmark	Sweden	Total
18–29	134 (17%)	85 (11%)	168 (15%)	387 (15%)
30–44	217 (27%)	192 (24%)	297 (27%)	706 (26%)
45–59	205 (26%)	217 (28%)	277 (26%)	699 (26%)
60+	233 (30%)	289 (37%)	354 (32%)	876 (33%)
All	789	783	1096	2668

Figure 1. Legend: Mean number of tick bites acquired in the residence (‘home’) municipality displayed over population density (persons/km²). Municipalities coloured blue had no respondent in the survey. Municipalities coloured red had one to five respondents. The rest had over five respondents. The figure displays maps for Denmark, Norway and Sweden.

Figure 2. Legend: Number of times a municipality was cited as ‘other place’ of tick bite for respondents not being bitten in the residence municipality displayed over population density (persons/km²). The figure displays maps for Denmark, Norway and Sweden.

Figure 3. Legend: Correlation indices between original variables and the four (Denmark and Sweden) or five (Norway) dimensions bearing at least 5% of the total variance resulting from the principal component analyses (PCA) at country level on individual responses. Darker blue/larger circle indicate stronger contributions. The figure displays the PCA for Denmark, Norway and Sweden.

Table 4. Number of respondents with tick bites and place of tick bite.

Tick bite	Norway	Denmark	Sweden	Total
Been bitten	389 (49.3%)	407 (52.0%)	781(71.3%)	1577 (59.1%)
Home	199 (51.2%)	192 (47.2%)	479 (60.7%)	870 (55.2%)
Other place	231 (59.4%)	255 (62.7%)	459 (58.8%)	945 (60.0%)
Abroad	25 (6.4%)	49 (12.0%)	45 (5.8%)	119 (7.5%)
Unknown	2 (0.5%)	5 (1.2%)	10 (1.3%)	17 (1.1%)

Table 5. Number of tick bites per respondent last 12 months.

Number of tick bites last 12 months	Norway	Denmark	Sweden	Total
1–5	144 (85.2%)	118 (88.7%)	331(89.5%)	593 (88.4%)
6–10	15 (8.9%)	9 (6.8%)	28 (7.6%)	51 (7.6%)
11–15	2 (1.2%)	2 (1.5%)	6 (1.6%)	10 (1.5%)
16–20	1 (0.6%)	1 (0.8%)	3 (0.8%)	5 (0.7%)
Above 20	7 (4.1%)	3 (2.2%)	2 (0.5%)	12 (1.8%)
Total number of respondents	169	133	370	671

Table 6. Have you got children under 18 years of age and have they been bitten?

	Norway	Denmark	Sweden	Tot
Got children	258 (33% of respondents)	226 (29% of respondents)	371 (34% of respondents)	855 (32% of respondents)
Bitten*	96 (37%)	122 (54%)	236 (64%)	454 (53%)

*Bitten: if several children the respondent only answers for the oldest one