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Should do a compression check after the engine is warmed up to get meaningful compression numbers. You can still do it cold, but the numbers might jump around a bit, useful for gross measurements.
My suggestion is to retest (warm or cold) - note the max pressure for each cylinder. Add a squirt of motor oil into each cylinder - retest and see how the number changes. Ideally, you want the numbers to be even across the cylinders - absolute pressure is not important, especially if testing on a cold engine.
When up to operating temp (I let mine cool down a bit, don't like to remove sparkplugs from a hot, aluminum head) - should be looking for pressure between 145PSI - 218PSI with no more than a 15PSI deviation between cylinders.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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