. 2015 Dec 22;9:438–448. doi: 10.2174/1874210601509010438

Table 2.

Assessment of attrition bias risk.

First author	Journal	Year	Vol.	Worst-case scenario
				First page	DS	Test group			Amalgam group				LTF adjusted effect estimate				Original effect estimate			Bias risk
						LTF	N = BSL teeth	n+LTF	LTF	N+LT		n	LTF adjusted effect estimate				Original effect estimate
						LTF	N = BSL teeth	n+LTF	LTF	N+LT		n	RR	95% CI		p	RR	95% CI	p
Sachdeo [31]	EurJProsthodontRestDent	2004	12	15	CA01	no LTF apparent during trial														No
Soncini [30]	JADA	2007	138	763	CA02	nil														Yes
Bernado [2]	JADA	2007	138	775	CA04	no LTF apparent during trial														No
Li [27]	PractClinMed	2005	6	105	GA02	nil														Yes
Frencken [28]	JDR	2006	85	622	GA07	18	52	21	10	33		10	1.33	0.72 - 2.46		0.36	0.20	0.06 - 0.66	0.008*	Yes
Frencken [28]	JDR	2006	85	622	GA10	127	288	135	105	218		5	20.44	8.52 - 49.03		<0.00001**	1.12	0.38 - 3.34	0.83	Yes
Estupiñán-Day [29]	PAHO-report/Panama	2006			GA17	144	769	166	118	677		8	18.27	9.03 - 36.86		<0.00001**	2.46	1.10 - 5.48	0.03**	No
First author	Journal	Year	Vol	Best-case scenario
				First page	DS	Test group			Amalgam group				LTF adjusted effect estimate				Original effect estimate			Bias risk
						LTF	N+LTF teeth	n	LTF		N = BSL	n+LTF	LTF adjusted effect estimate				Original effect estimate
						LTF	N+LTF teeth	n	LTF		N = BSL	n+LTF	RR		95% CI	p	RR	95% CI	p
Sachdeo [31]	EurJProsthodontRestDent	2004	12	15	CA01	no LTF apparent during trial														No
Soncini [30]	JADA	2007	138	763	CA02	nil														Yes
Bernado [2]	JADA	2007	138	775	CA04	no LTF apparent during trial														No
Li [27]	PractClinMed	2005	6	105	GA02	nil														Yes
Frencken [28]	JDR	2006	85	622	GA07	18	52	3	10	33		20	0.10	0.03 - 0.30		<0.00001*	0.20	0.06 - 0.66	0.008*	No
Frencken [28]	JDR	2006	85	622	GA10	127	288	8	105	218		110	0.06	0.03 - 0.11		<0.00001*	1.12	0.38 - 3.34	0.83	Yes
Estupiñán-Day [29]	PAHO-report/Panama	2006			GA17	144	769	22	118	677		126	0.15	0.10 - 0.24		<0.00001*	2.46	1.10 - 5.48	0.03**	Yes

LTF = Number of restorations lost to follow-up; Vol. = Journal volume; DS = Dataset number; N = Number of restorations evaluated; BSL = Number of restorations at baseline; n = Number of failed restorations; RR = Risk ratio; CI = Confidence interval; EurJProsthodontRestDent = European Journal of Prosthodontic Dentistry; JADA = Journal of the American Dental Association; PractClinMed = Practice Clinical Medicine; JDR = Journal of Dental Research; PAHO = Pan-American Health Organisation; *Difference statistically significant in favour of test group; ** Difference statistically significant in favour of control group.