Multimedia Appendix 1

Table S1: Missing user analysis. Active social network app users have a higher burden of anxiety, stress, and trauma-related disorder diagnoses. Data represent N and percentage of available diagnoses unless otherwise specified, between missing or inconsistent users (social network app; n=100, communication app; n=68), i.e. time logged are either fewer than 22 days during the 44 days of the pre-lockdown period, or fewer than 26 days during the 51-days of lockdown period, and active users (social network app; n=42, communication app; n=74, greater than 22 days in pre-lockdown and greater than 26 days in lockdown). Psychiatric diagnosis categories are not mutually exclusive. Statistically significant differences between the clinical anxiety and nonclinical anxiety groups were obtained by two-sided t-test for age, GAD-7; two-sided z-test for gender, cohabitation status, coronavirus exposure risk items, and diagnosis; chi-square independence test for all other categorical variables. Pairwise nominal independence test shows that the significance in chi-square test in employment status variable is driven by an employee, student, or homemaker ~ unemployed without benefits and ~ retired, P=.05, .03 respectively).