SPACI score report for 1sz3 in ASTRAL 2.07:

PDB Entry: 1sz3
SPACI score: 0.56
AEROSPACI score: 0.56

Experiment type: XRAY
Resolution: 1.6
R-factor: 0.213
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.103
WCK2 WHAT_CHECK Ramachandran: 0.43
WCK3 WHAT_CHECK Chi angles: -0.522
WCK4 WHAT_CHECK Backbone: 1.72

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).