C# error help ( CS0023 Operator '--' cannot be applied to operand of type 'Stat'

Ive been using the help of multiple sources for my code to pile together a game, and its working somewhat well except for the fact that i cant get my player to take damage

 public class PlayerHealth : MonoBehaviour
 {
     [SerializeField]
     private Stat health;
 
     private void Awake ()
     {
         health.Initialize();     
     }
 
     void Update ()
     {
         
     }
     void OnCollisionEnter2D(Collision2D coll)
     {
         if (coll.gameObject.tag == "blob_enemy")
         {
             health--;
 
             if (health < 0)
                 health = 0;
 
             coll.gameObject.GetComponent<PlayerHealth>().receiveDamage(10);
         }
     }
     public void receiveDamage(float amount)
     {
         health -= amount;
         if (health <= 0)
         {
             Destroy(gameObject);
         }
     }
 }

i don't quite know what to do in t$$anonymous$$s situation so some help would be appreciated, i'm using unity 5.6.