SPACI score report for 1zbb in ASTRAL 2.02:

PDB Entry: 1zbb
SPACI score: -0.16
AEROSPACI score: -0.16

Experiment type: XRAY
Resolution: 9
R-factor: 0.386
PCK1 PROCHECK Ramachandran: 4
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 0.643
WCK2 WHAT_CHECK Ramachandran: 0.453
WCK3 WHAT_CHECK Chi angles: -0.217
WCK4 WHAT_CHECK Backbone: 0.879

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).