Table 2.

Positive Predictive Value (PPV) for each Facebook alcohol display location and self-reported past 28-day alcohol behaviors among college students from two universities

	Number (%) with initial display in this location	Outcome: Past 28-day alcohol use reported using TLFBa
		Any alcohol use		Any binge episodes		Excessive drinkingb
Facebook profile location		PPV	95%CI	PPV	95%CI	PPV	95%CI
Status updates	73 (54.1%)	75.34	63.86 – 84.68	57.53	45.41 – 69.03	31.51	21.13 – 43.44
Photographs	59 (43.7%)	86.44	75.02 – 93.96	83.05	71.03 – 91.56	47.46	34.30 – 60.88
Likes	12 (8.9%)	58.33	27.67 – 84.83	50.00	21.09 – 78.91	33.33	9.92 – 65.11
Multiple locations	11 (8.1%)	81.82	48.22 – 97.72	81.82	48.22 – 97.72	54.55	23.38 – 83.25
Profile picture or Cover photo	2 (1.5%)	100	15.81 – 100	100	15.81 – 100	100	15.81 – 100
Prevalence		106/135 = 78.52%		90/135 = 66.67%		51/135 = 37.78%

^aTLFB: TimeLine FollowBack

^bExcessive drinking defined as 4 or more binge episodes in past 4 weeks