▁active , ▁and ▁resid ual ▁phases ) ▁must ▁last ▁at ▁least ▁ 1 ▁month ▁but ▁not ▁more ▁than ▁ 6 ▁months , ▁while ▁in ▁sch iz op hren ia ▁the ▁sympt oms ▁must ▁be ▁present ▁for ▁a ▁minimum ▁of ▁ 6 ▁months . ▁ ▁C ause ▁▁ ▁The ▁exact ▁cause ▁of ▁the ▁dis order ▁remains ▁unknown , ▁and ▁relatively ▁few ▁studies ▁have ▁focused ▁exclus ively ▁on ▁the ▁et i ology ▁of ▁sch iz op hren iform ▁dis order . ▁Like ▁other ▁psych otic ▁dis orders , ▁a ▁di ath esis – str ess ▁model ▁has ▁been ▁proposed , ▁suggesting ▁that ▁some ▁individuals ▁have ▁an ▁underlying ▁mult ifact orial ▁gen etic ▁vulner ability ▁to ▁the ▁dis order ▁that ▁can ▁be ▁triggered ▁by ▁certain ▁environmental ▁factors . ▁Sch iz op hren iform ▁dis order ▁is ▁more ▁likely ▁to ▁occur ▁in ▁people ▁with ▁family ▁members ▁who ▁have ▁sch iz op hren ia ▁or ▁b ip olar ▁dis order . ▁ ▁Di agn osis ▁If ▁the ▁sympt oms ▁have ▁pers isted ▁for ▁at ▁least ▁one ▁month , ▁a ▁prov is ional ▁diagn osis ▁of ▁sch iz op hren iform ▁dis order ▁can ▁be ▁made ▁while ▁waiting ▁to ▁see ▁if ▁recovery ▁occurs . ▁If ▁the ▁sympt oms ▁resolve ▁within ▁ 6 ▁months ▁of ▁on set , ▁the ▁prov is ional ▁qual ifier ▁is ▁removed ▁from ▁the ▁diagn osis . ▁However , ▁if ▁the ▁sympt oms ▁persist ▁for ▁ 6 ▁months ▁or ▁more , ▁the ▁diagn osis ▁of ▁sch iz op hren iform ▁dis order ▁must ▁be ▁re vised