AFAIK, 'GetObjectStat(i,'active')' works at the same way as 'GetPlayerStat(i,'active')' (checks if that object is active)
Also, GetSpawnStat(i,'active') can be used with SetSpawnStat(i,'Active')
GetSpawnStat checks if its used (enables / disabled) and you can enable / disable it w/ SetSpawnStat