
    Write a function to calculate the ratio between normal health readings and abnormal readings in a patient's historical medical data, where normal readings are represented by zeros and abnormal readings by non-zero values. This ratio will help determine the patient's overall stability and potential readmission risk based on their medical history.
    

    
from array import array

def zero_count(nums):
    """
    Write a function to calculate the ratio between normal health readings and abnormal readings in a patient's historical medical data, where normal readings are represented by zeros and abnormal readings by non-zero values. This ratio will help determine the patient's overall stability and potential readmission risk based on their medical history.
    

    """
from array import array

def zero_count(nums):
    """
    Write a function to calculate the ratio between normal health readings and abnormal readings in a patient's historical medical data, where normal readings are represented by zeros and abnormal readings by non-zero values. This ratio will help determine the patient's overall stability and potential readmission risk based on their medical history.
    

    """
    n = len(nums)
    n1 = 0
    for x in nums:
        if x == 0:
            n1 += 1
        else:
            None
    return n1 / (n - n1)