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Table 2 Differences regarding age at death / year of death depending on the drug involved

From: Drug-related celebrity deaths: A cross-sectional study

  Mean age at death Mean year of death
Mean (SD) CI 95% of mean difference Significance of t-test a:
p-value
Mean (SD) CI 95% of mean difference Significance of t-testa
p-value
All (ages 18–82) 38.6 (12.1) n/A n/A 1995 (13.0) n/A n/A
Heroin use (yes/no) 34.8 (8.9) −8.9–−3.1 p < 0.01 1995 (12.3) −3.9–3.3 p = 0.868
Prescription opioid use (yes/no) 35.4 (7.7) −7.0–−1.0 p = 0.01 2003 (7.9) 7.7–13.9 p < 0.01
Other prescription drug use (yes/no) 41.9 (13.1) 2.4–9.0 p < 0.01 1993 (14.2) −3.3–0.9 p = 0.13
Cocaine use
(yes/no)
37.3 (10.9) −5.4–1.7 p = 0.297 1991 (10.3) 2.3–8.9 p < 0.01
  1. a T-test for independent samples was conducted to examine the mean difference of age at death and mean year of death in users and non-users
  2. Sample size: 220; Degrees of freedom (df) 218