SPACI score report for 1zpb in ASTRAL 2.07:

PDB Entry: 1zpb
SPACI score: 0.43
AEROSPACI score: 0.43

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.19
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 1.377
WCK2 WHAT_CHECK Ramachandran: -1.606
WCK3 WHAT_CHECK Chi angles: -0.388
WCK4 WHAT_CHECK Backbone: 0.138

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).