SPACI score report for 1zh4 in ASTRAL 2.07:

PDB Entry: 1zh4
SPACI score: 0.34
AEROSPACI score: 0.34

Experiment type: XRAY
Resolution: 2.2
R-factor: 0.229
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.612
WCK2 WHAT_CHECK Ramachandran: -2.143
WCK3 WHAT_CHECK Chi angles: -3.402
WCK4 WHAT_CHECK Backbone: -0.079

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).