Table 2

 Urinary Pt concentration in police officers grouped by age

Age (years)Subjects (no.)Mean (SD)* (ng/l)
*Data referred to collections at the beginning and end of shift.
†Police officers engaged in office work (number of “useful values”: 49).
‡Police officers engaged in traffic control (number of “useful values”: 94).
Control subjects†
⩽3021.62 (1.29)
31–40193.98 (3.18)
41–50186.35 (3.38)
⩾51104.30 (2.30)
Exposed subjects
⩽30194.51 (2.30)
31–40344.30 (2.55)
41–50205.16 (2.87)
⩾51215.75 (3.81)