One more thing. P in this case =preterm. Wehn you are thinking of parity, that is the number of actual births. sometimes the letters are GPTPAL, but rarely. Usually if parity is considered, as in...
G= number of pregnancies, so in this case 5 actual pregnancies (it doesn't matter how many babies per pregnancy) T= the number of births at term (37 weeks or more). In this case 3 P= preterm births...