Why < is slower than >=

I am using the following code to do the test and it seems like < is slower that >=., does anyone know why?

import timeit
s = """
  x=5
  if x<0: pass
"""
  t = timeit.Timer(stmt=s)
  print "%.2f usec/pass" % (1000000 * t.timeit(number=100000)/100000)
#0.21 usec/pass
z = """
  x=5
  if x>=0: pass
"""
t2 = timeit.Timer(stmt=z)
print "%.2f usec/pass" % (1000000 * t2.timeit(number=100000)/100000)
#0.18 usec/pass