<prompt> Translate the following text to SwahiliThese early crosssectional studies were criticized for a number of methodological limitations, particularly for inadequate control at the individual level for variables that are potentially important in causing mortality, such as wealth, smoking, and diet.  <response>: Uchunguzi huu wa kwanza ulikosolewa kwa sababu ya mapungufu kadhaa ya mbinu, haswa kwa udhibiti usio wa kutosha katika kiwango cha mtu binafsi kwa vigezo ambavyo vinaweza kuwa muhimu katika kusababisha vifo, kama vile utajiri, uvutaji sigara, na lishe. 