(absolute risk, risk difference)
,
AR= RF+ - RF-
4. ( )
(attributable fraction - AF, etiological fraction - EF)
1)
2)
(attributable population risk ARP)
,
AR
Ip
, , .
()
(odds ratio OR)
1:
.
a/(a+b)
.
c/(c+d)
.
F+ = F+/1- F+
.
F- = F-/1- F-
().
= F+ / F-
2:
- .
F+ = a/b
- .
F- = c/d
- ().
= F+ / F-
3:
ü ().
, .
OR < 1 - .
OR > 1 , .. - .
7. c2 (-), ( , , ),
- .
c 2, , , , .
c2 :
ü ;
ü .
,
, N 40. (a, b, c d) 5, 0, ( ):
c2 - .
, , , , , c2 c2 - ( ). :
|
|
c2 = 3,841 =0,05
c2 = 6,635 - =0,01
, c2 , , ( ) 3,841.
.
.
ü ( ) , , .
ü , , , .
ü .
ü .
ü , , (, .).
.
ü , . , .
ü .
ü .
- -.
-: . - - , () .
- : .
- .
-:
(a F+, b F-, c F+ d F-) , .
:
ü ();
ü ( : -);
ü , ;
ü .