Regular users and high usersRR=1.5 (R), 2 (H)RR=1.5 (R), 2.5 (H)RR=1.5 (R), 3 (H)
11.2(0.5 to 1.9)1.3(0.6 to 2)1.4(0.8 to 2.1)
53.2(2.4 to 3.9)3.5(2.8 to 4.3)3.9(3.1 to 4.6)
103.2(2.4 to 4)3.6(2.8 to 4.4)4.0(3.2 to 4.8)
151.5(0.7 to 2.4)1.8(0.9 to 2.6)2.0(1.2 to 2.9)
200.2(−0.7 to 1)0.2(−0.6 to 1.1)0.2(−0.6 to 1.1)
  • APC, annual percentage change; RR, relative risk.