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Table 1 Comparison of participants in both waves to those who participated only in Wave 1

From: Non-participation and attrition in a longitudinal study of civilians exposed to the January 2015 terrorist attacks in Paris, France

 Total
N = 190
Lost to follow-up N = 67Waves
1 & 2 N = 123
ORCIp-value
N/m%/sdN/m%/sdN/m%/sd
Socio-demographics
 Female Gender11560.54059.77561.00.95[0.85–1.74]0.864
 Age at time of terrorist attack:
mean41.813.638.814.343.512.9   
min-max19–8419–8423–79   
   [18–30]4925.82638.82318.7ref 0.007
   [31–50]9449.53044.86452.00.41[0.20–0.84]
   ≥ 514724.71116.43629.20.27[0.11–0.65]
 Educational Level < high-school diploma5730.22435.83327.00.66[0.35–1.26]0.210
 Unemployed3417.91420.92016.31.36[0.64–2.91]0.427
 Living alone4624.21014.93629.30.42[0.20–0.92]0.030
 Non-French origin136.8811.954.13.20[1.01–10.21]0.049
Terror exposure
 Event location outside of Paris (vs Paris)13168.93958.29274.82.13[1.13–4.01]0.019
 Geographic exposure:
Less than 10 m2010.569.01411.41.39[0.32–6.08]0.639
Very close, next room6433.72334.34133.31.82[0.53–6.25]
Neighbouring building8946.83450.75544.72.01[0.61–6.67]
Elsewhere178.946.01310.6ref 
 Objective exposure:
Directly threatened5830.52232.83629.30.86[0.37–2.00]0.516
Indirectly threatened8243.22740.35544.70.38[0.09–1.61]
Close relative of victims147.434.5118.90.69[0.31–1.54]
Witness3618.91522.42117.1ref 
 Perceived terror exposure (0–10)6.33.06.13.16.43.00.97[0.88–1.07]0.518
Peri-traumatic reactions
 PDEQ (0–40)15.510.514.210.816.210.30.98[0.95–1.01]0.226
 STRS (0–52)22.511.620.912.923.410.90.98[0.96–1.01]0.170
Sheehan disability scale
 Work (impact ≥4)8345.11928.86454.20.34[0.18–0.65]0.001
 Social life (impact ≥4)7539.52232.85343.10.65[0.35–1.20]0.168
 Family life, home responsibilities (impact ≥4)6634.72334.34335.00.97[0.52–1.82]0.930
Psychological support
 No psychological support (after 48 h, 1w, or > 1w)4624.22232.82419.52.00[1.01–3.93]0.046
 No regular psychological follow-up after attack14476.25583.38972.41.91[0.89–4.08]0.094
 Dissatisfaction with psychological support from professionals5632.62239.33429.31.56[0.80–3.05]0.192
Media impact
 Contacted by media regarding the event11661.14059.77661.80.92[0.50–1.68]0.778
 Interviewed by media regarding the event6334.82843.83529.91.82[0.97–3.43]0.063
Social support
 Feeling alone2714.2710.42016.30.60[0.24–1.50]0.277
 No perceived moral/emotional support21.111.510.81.85[0.11–30.03]0.666
 No perceived financial/material support3719.51116.42621.10.73[0.34–1.60]0.434
 No perceived everyday support2010.569.01411.40.77[0.28–2.10]0.603
Mental health
 PTSD (previous month)3417.91420.92016.31.36[0.64–2.91]0.427
 Major depressive disorder (last two weeks)2010.5710.41310.60.99[0.37–2.61]0.979
 Suicide risk (previous month)5227.41522.43730.10.67[0.34–1.34]0.257
 Anxiety disorders (at least one)5026.51623.93427.90.91[0.47–1.73]0.764
 Moderately/markedly/severely ill (CGI)5529.41726.23831.10.78[0.40–1.53]0.476
  1. IMPACTS survey, France, 2015
  2. N Number, m Mean, sd Standard deviation, OR Odds ratio, CI Confidence interval, ref Reference. P-value was two-sided statistical significance level of the logistic regression. P-values in bold were lesser than 0.10