Arthritis

Arthritis / 2014 / Article / Tab 3

Research Article

Productivity Improvements in Hip and Knee Surgery

Table 3

Average treatment effects on the treated (ATT) for 1998–2010 and subperiods.

Outcome levelsHipKnee
ObservationsATT95% Confidence intervalObservationsATT95% Confidence interval

All-year periods
ADL limitations 1,220−0.10(−0.23, 0.04)4,004−0.21(−0.28, −0.14)*
IADL limitations1,220−0.14(−0.26, −0.03)*4,004−0.14(−0.20, −0.09)*
Mobility limitations 1,220−0.34(−0.52, −0.16)*4,006−0.46(−0.56, −0.36)*
Large muscle index1,220−0.24(−0.38, −0.10)*4,004−0.24(−0.31, −0.16)*
Fine motor index1,2200.02(−0.06, 0.10)4,004−0.10(−0.14, −0.06)*
Gross motor index1,220−0.33(−0.49, −0.17)*4,004−0.33(−0.41, −0.24)*
Pain1,222−0.23(−0.28, −0.18)*4,004−0.19(−0.21, −0.16)*
Pain restrict1,222−0.24(−0.29, −0.18)*4,004−0.20(−0.23, −0.17)*

Subperiod results
ADL limitations
 1998–20003400.07(−0.21, 0.35) 958−0.14(−0.29, 0.01)
 2002–2006496−0.11(−0.31, 0.09)1,812−0.15(−0.26, −0.05)*
 2008–2010382−0.17(−0.41, 0.07)1,228−0.21(−0.33, −0.09)*
IADL limitations
 1998–2000340−0.01(−0.24, 0.21) 958−0.05(−0.16, 0.07)
 2002–2006496−0.12(−0.28, 0.03)1,812−0.10(−0.19, −0.02)*
 2008–2010382−0.25(−0.47, −0.03)*1,228−0.17(−0.27, −0.07)*
Mobility limitations
 1998–2000340−0.69(−1.04, −0.34)* 958−0.43(−0.64, −0.22)*
 2002–2006496−0.43(−0.71, −0.15)*1,812−0.52(−0.67, −0.37)*
 2008–2010382−0.50(−0.83, −0.17)*1,228−0.48(−0.66, −0.31)*
Large muscle index
 1998–2000340−0.21(−0.47, 0.04) 958−0.22(−0.37, −0.07)*
 2002–2006496−0.39(−0.60, −0.17)*1,812−0.20(−0.31, −0.08)*
 2008–2010382−0.46(−0.71, −0.21)*1,228−0.24(−0.37, −0.10)*
Fine motor index
 1998–20003400.13(−0.03, 0.29) 958−0.05(−0.14, 0.04)
 2002–2006496−0.05(−0.18, 0.07)1,812−0.09(−0.15, −0.03)*
 2008–2010382−0.13(−0.27, 0.01)1,228−0.10(−0.17, −0.03)*
Gross motor index
 1998–2000340−0.14(−0.46, 0.18) 958−0.27(−0.45, −0.09) *
 2002–2006496−0.27(−0.51, −0.04)*1,812−0.31(−0.44, −0.19)*
 2008–2010382−0.40(−0.68, −0.12)*1,228−0.34(−0.49, −0.19)*
Pain
 1998–2000340−0.26(−0.36, −0.16)* 958−0.17(−0.23, −0.11)*
 2002–2006496−0.25(−0.33, −0.17)*1,812−0.19(−0.23, −0.15)*
 2008–2010382−0.25(−0.34, −0.16)*1,228−0.17(−0.23, −0.12)*
Pain restrict
 1998–2000340−0.22(−0.32, −0.11)* 958−0.14(−0.20, −0.08)*
 2002–2006496−0.24(−0.32, −0.15)*1,812−0.20(−0.25, −0.16)*
 2008–2010382−0.31(−0.41, −0.22)*1,228−0.20(−0.25, −0.14)*

Statistically significant < 0.05.