Appendix 2 Further analysis of platelet count (×109/l) data by hospital, position, and year of testing

Hospital Position Year 1 Year 3 p Value
Hospital Nos 1 and 32-1-151 Technicians243 (53)243 (57)0.909
n=164n=164
Support257 (62)256 (55)0.828
n=40n=40
Hospital No 22-1-150 Technicians236 (49)208 (41)0.000
n=82n=82
Support245 (55)226 (51)0.002
n=14n=14
Laboratory usedAB
Reference range (K/mm3)140–400130–400

  • ↵2-1-150 Laboratory used in 1996 and 1997 was A, and in 1998 it was B.

  • ↵2-1-151 The same laboratories were used in 1996–8.