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1.1

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aecee eo copa opa. aecee cceoa a cop, aa eppea ax ye ae a e, o ea oop.



aee apeox cceoax pecae coo eo copa epo apeoo opa o yaeo oee ye ae a pa pya e, ec cya. aee apeoo cceoa oe apaeo a ocee pax ee. o oe cooao a co opa ocpoe oe, cy poep ax, oyex py eoa, c eo oo oo e ooee cee o yaeo oee.

aee ec eca pyoe eoo. opee oo ae aae opo a paa oe pee, e cao aee.

o xapaepy opyae ocao aee oe oe, o oaae, o poecc poxo ececeo ocaoe ( aae, y p aaa), aopaop, .e. pooc cycceo coao cya. eya ae cpyc c oo ayo- eoex, ooax ..

aece cceoa ae oocc: yoe ep, aa poooa poeo eo.

yoe ep aaec oceoaeo aa apoa epepo pecoey py opoco ex oa, oey e py ey ce opeee opao, o o ya o opeeeo poee.

a poooa aaec oee pecoea opeeey cya o p pee, p o o oe coeco oca ce aop apye, oop o pyoocoac p p pee. oa p pee aoo eoa coyec aoo. ae cceoae aapye pooo, pecaee pecoea.

p cooa poeox eoo pecoe oeac opeeee pyee cya aee a o, o pecoe cay ay opa o cee, oopy eooo oy p poee poo opoca, apep, ooceo opee apoo, aoo, oye aex ..

oecee eo copa opa. oecee cceoa oo ooec c poeee pax opoco, ocoax a cooa cpyyppoax opoco apoo a, a oope oeae ooe co pecoeo.

poc aaec cope epo opa ye poo aaa opoco ooceo ypo x a, ooe poyy, peoe oyaecoo oee. poc oe oc cpyypoa ecpyypoa xapaep; epo cyae ce opaaee oea a o e e opoc, o opo - epep aae opoc acoc o oyex oeo.

p poee opoca pya opaaex oe oepac oopaoy, oopa oceoa. epo cyae oyaec a oepe cpe ao py o o apaepa cpoaoo oea pee (cross-sectional study - "oepeoe" yee).

o opo cyae oa a e pya opaaex, aaea ae, eoopao yaec eee opeeeoo epoa pee (longitudinal study - "poooe" yee). ae aee coyc p poee ox apeox cceoa. o cyae aco oop, o coyec ae eo opoca.

. .

. 1.2.

1.2

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