epe ae oyac peyae ceao poeex pee opeo apeoo poe a aaex "oex" apeox cceoa, x cop ocyecec ye ae, opoco, cepeax cceoa.
o op a, pee p poee a aaex "aex" apeox cceoa, oac ae, copae paee ypex ex coo ee, ox o ee apeox cceoa. py coa, ope ae e c peyao poee ceax apeox cceoa.
aee cceoa c aoee ocy ee eoo poee apeox cceoa. ax, a opo cpex opaa - o paec opy eo oye apeoo opa.
op opo opa oo peecye copy epo opa. ope ae ooa cceoae oee yoo oaoc c cyae opac, c ee ee oea poa p, oypea, oce oce ay ex.
ypee ee co opa. ype coa cya oe oa, ece c copya oea ca py pyooe copya, apeoa opaoa ccea, yxaepce acoe oe; oe pyooee a copax aoepo; cooe opooo epcoaa, oe o oapoax, oop ao peaa opeee, aoapcee ca, a pooca , pooo acea pyooca, eoa oppecoe p p.
e coa c ae eyapox opaa (eyapo a o, poeca opaa o copyecy pa, ); ao, ya, ocaoe ocyapcex opao, cye ocyapcex, oecx oecex eee, ae oao cac, epoeco ea, peya ayx cceoa .. coa ee opo opa ae oocc: ca, pap, coea, oepe, peea, opx epe, oepece a a ax.
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.
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