ACFT EQUIP PROB -- EXIT DOOR SEPARATED INFLT WITH DEPRESSURIZATION. FLT ATTENDANT ALMOST SUCKED OUT OF ACFT; SAVED BY PAX.

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CREW OF 4: CAPT; FO; FLT ATTENDANT #1 SEATED AT REAR OF ACFT; FLT ATTENDANT #2 SEATED AT FORWARD OF ACFT. DEPARTED RWY 4L. AT APPROX 600 FT AGL; 'MASTER CAUTION;' 'DOORS' AND 'CABIN' DOOR WARNING LIGHTS ILLUMINATED. FELT ACFT DEPRESSURIZING. BEGAN IMMEDIATE LEVEL OFF AND PWR REDUCTION TO MAINTAIN AS SLOW AN AIRSPD AS POSSIBLE (FLAPS 15 DEGS; CLB SEQUENCE COMPLETED). ACFT HAD INTERMITTENT YAW OCCILATIONS. INSTRUCTED FLT ATTENDANT (#1?) TO 'STAY AWAY FROM THE DOOR.' NOTIFIED ATC OF EMER AND WE WERE RETURNING TO ORD. FLT ATTENDANT #2 (SEATED IN 1B AS HER JUMP SEAT WAS DEFERRED) INFORMED US THAT FLT ATTENDANT #1 WAS BEING SUCKED OUT OF ACFT; LATER SAID FLT ATTENDANT #1 WAS GONE. (FLT ATTENDANT #2 INFORMED US STILL LATER THAT FLT ATTENDANT #1 WAS IN ACFT BUT INJURED AND PAX HELPED PULL HER BACK INTO THE ACFT.) INFORMED ATC WE WANTED EMER EQUIP WAITING. LANDED RWY 22R. (DURING FLT AND ESPECIALLY ON FINAL APCH ACFT EXHIBITED INTERMITTENT YAW OSCILLATIONS.) AFTER LNDG WE REQUESTED EQUIP TO FOLLOW US TO 'PENALTY BOX' (ACFT HOLDING AREA S OF RWYS 22R AND 9L) AND WE HAD INJURIES. PARKED ACFT; SENT FO TO CABIN TO CHK ON FLT ATTENDANT #1; FLT ATTENDANT #2 AND PAX. CALLED COMPANY; ETC. CFR TREATED FLT ATTENDANT #1 AND TRANSPORTED TO HOSPITAL. FLT ATTENDANT #2 TREATED FOR SHOCK. CFR ALSO INFORMED US THAT DOOR WAS NOT ON ACFT. PAX TRANSPORTED TO TERMINAL BY BUS.