WordNet

expose to a chance of loss or damage; "We risked losing a lot of money in this venture"; "Why risk your life?"; "She laid her job on the line when she told the boss that he was wrong" (同)put on the line, lay on the line
a venture undertaken without regard to possible loss or injury; "he saw the rewards but not the risks of crime"; "there was a danger he would do the wrong thing" (同)peril, danger
the probability of being exposed to an infectious agent (同)risk of exposure
the probability of becoming infected given that exposure to an infectious agent has occurred (同)risk of infection
newly come into prominence; "a rising young politician"
advancing or becoming higher or greater in degree or value or status; "a rising trend"; "a rising market"
capable of being attributed; "the collapse of the movement was attributable to a lack of morale"; "an idea attributable to a Russian"

PrepTutorEJDIC

『危険』;危害(損害)を受ける可能性《+『of』+『名』(do『ing』)》 / 〈生命など〉‘を'『危険にさらす』 / …‘を'危険(失敗,損失など)を覚悟してする
〈U〉(…が)上がること,(…の)上昇;昇進《+『of』+『名』》 / 〈U〉起床 / 〈C〉蜂起,反乱 / 上がる,強まる,高まる / 成長する,発達中の,上り坂にある
ほぼ(…)歳
(原因などが)(…の)せいにできる,(…に)起因する;(…に)備わった;(…の)作と考えられる《+『to』+『名』》
『パーセント』,100につき(…の割),100分(の…)《+『of』+『名』》《記号》%;《略》『p.c.』) / …パーセントだけ

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/12/31 11:38:12」(JST)

Attributable risk percent (ARP) is a calculation that can be derived from attributable risk.^[1]

It gives the portion of cases attributable (and avoidable) to this exposure in relation to all cases.

It can be calculated as (relative risk - 1) / relative risk.^[1]

Worked example[edit]

	Example 1: risk reduction			Example 2: risk increase
	Experimental group (E)	Control group (C)	Total	(E)	(C)	Total
Events (E)	EE = 15	CE = 100	115	EE = 75	CE = 100	175
Non-events (N)	EN = 135	CN = 150	285	EN = 75	CN = 150	225
Total subjects (S)	ES = EE + EN = 150	CS = CE + CN = 250	400	ES = 150	CS = 250	400
Event rate (ER)	EER = EE / ES = 0.1, or 10%	CER = CE / CS = 0.4, or 40%		EER = 0.5 (50%)	CER = 0.4 (40%)

Equation	Variable	Abbr.	Example 1	Example 2
CER − EER	< 0: absolute risk reduction	ARR	(−)0.3, or (−)30%	N/A
CER − EER	> 0: absolute risk increase	ARI	N/A	0.1, or 10%
(CER − EER) / CER	< 0: relative risk reduction	RRR	(−)0.75, or (−)75%	N/A
(CER − EER) / CER	> 0: relative risk increase	RRI	N/A	0.25, or 25%
1 / (CER − EER)	< 0: number needed to treat	NNT	(−)3.33	N/A
1 / (CER − EER)	> 0: number needed to harm	NNH	N/A	10
EER / CER	relative risk	RR	0.25	1.25
(EE / EN) / (CE / CN)	odds ratio	OR	0.167	1.5
EER − CER	attributable risk	AR	(−)0.30, or (−)30%	0.1, or 10%
(RR − 1) / RR	attributable risk percent	ARP	N/A	20%
1 − RR (or 1 − OR)	preventive fraction	PF	0.75, or 75%	N/A

^ ^a ^b Cole P, MacMahon B (November 1971). "Attributable risk percent in case-control studies". Br J Prev Soc Med 25 (4): 242–4. PMC 478665. PMID 5160433. Cite uses deprecated parameters (help)

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