3.4 Analysis by age group Table 3 shows symptom scores on the K-10, PHQ-9, and GAD-7 by age group for both the comparison sample and the COVID-19 sample, and the level of concern and changes to routine by age group for the COVID-19 sample. Baseline symptom scores on the K-10, PHQ-9, and GAD-7 decreased with age for both samples, however the degree of concern about COVID-19 increased with age, from 15.0% in the 18–29 years age group to 35.5% in the over 55 years age group. Similarly, changes to routine increased with age, with 24.8% of 18–29-year olds reporting significant changes compared to 37.8% of the over 55 years age group. Table 3 Analyses of symptom scores and COVID-19 responses by sample and age group. 18–29 years 30–54 years 55 years and over Significance Comparison sample  K-10 32.6 (7.3) 30.3 (7.6) 29.1 (8.1) F = 22⁎⁎⁎  PHQ-9 15.2 (6.1) 13.6 (6.3) 13.2 (6.0) F = 14.13, p < .001⁎⁎⁎  GAD-7 12.8 (5.0) 12.0 (5.2) 10.3 (5.5) F = 14.67, p < .001⁎⁎⁎ COVID-19 sample  K-10 33.2 (7.1) 30.4 (8.0) 28.1 (8.1) F = 39.12, p < .001⁎⁎⁎  PHQ-9 15.6 (5.8) 13.6 (6.3) 12.3 (6.5) F = 27.30, p < .001⁎⁎⁎  GAD-7 13.2 (5.0) 12.4 (5.4) 10.5 (5.8) F = 16.77, p < .001⁎⁎⁎ Knows someone diagnosed with COVID-19 2.6% (17/666) 3.3% (21/632) 2.3% (4/171) ꭙ2 = 0.88, p = .64 Extremely concerned about COVID-19 15.0% (100/665) 23.5% (149/634) 35.5% (61/172) ꭙ2 = 37.31, p < .001⁎⁎⁎ Made significant changes to routine 24.8% (165/663) 30.8% (195/629) 37.8% (65/171) ꭙ2 = 13.40, p < .01⁎⁎ ⁎ p < .05. ⁎⁎ p < .01. ⁎⁎⁎ p < .001.