Table 1 Summary statistics for depression and PTSD tweet collection (Ndepr = 279,951, Nptsd = 243,775).

From: Forecasting the onset and course of mental illness with Twitter data

Depression Users Posts Posts \(\mu \)(\(\sigma \)) Posts (median)
Total 204 279,951 1373 (1282) 862
Depressed 105 164,218 1564 (1332) 1127
Healthy 99 115,733 1169 (1200) 574
PTSD Users Posts Posts \(\mu \) (\(\sigma \)) Posts (median)
Total 174 243,775 1401 (1284) 946.5
Has PTSD 63 91,589 1564 (1332) 1058
Healthy 111 152,186 1371 (1268) 893