Table 1. Characteristics of prospective cohort studies of body mass index and risk of bladder cancer.
| Study | Area | Follow-up period (years) | Mean age (year-old) | Sample size | Cases | NOS | Cut-off | Outcome (RR 95%CI) | |
|---|---|---|---|---|---|---|---|---|---|
| Male | Female | ||||||||
| Roswall 2014 [8] | Denmark, Sweden, Germany, The Netherlands, United Kingdom, France, Italy, Spain, Greece | 1992-2008 (11.7y) | 52.3 | 390,878 | 1,391 | 9 | Q1 Q2 Q3 Q4 | Reference 1.20 (1.01-1.43) 1.11 (0.93-1.33) 1.25 (1.04-1.50) | Reference 1.07 (0.80-1.43) 0.97 (0.73-1.30) 0.91 (0.68-1.23) |
| Guo 2014 [9] | China | 2006-2011 (4.28y) | 51.1 | 106,630 | 64 | 7 | <18.5 18.5-24.0 24.0-28.0 ≥28.0 | 1.24 (0.38-4.08) Reference 0.44 (0.23-0.84) 0.86 (0.40-1.87) | |
| Haggstrom 2011 [10] | Norway, Austria, Sweden | 11.7y | 44 | 578,699 | 1,914 | 9 | Q1 Q2 Q3 Q4 Q5 | Reference 1.06 (0.89-1.28) 1.06 (0.88-1.26) 0.97 (0.80-1.16) 1.13 (0.94-1.35) | Reference 1.00 (0.66-1.51) 1.00 (0.67-1.50) 0.67 (0.44-1.03) 0.87 (0.58-1.32) |
| Larsson 2008 [11] | Sweden | 1998-2007 (9.3y) | NR | 43,480 | 388 | 8 | 18.0-24.9 25.0-29.9 30.0-34.9 ≥35.0 | Reference 0.98 (0.79-1.20) 0.92 (0.62-1.34) 0.79 (0.29-2.14) | |
| Jee 2008 [12] | Korea | 1992-2006 (10.8y) | 47.2 | 1,213,829 | 2,439 | 9 | <20.0 20.0-22.9 23.0-24.9 25.0-29.9 ≥30.0 | 0.84 (0.68-1.04) 0.91 (0.78-1.05) Reference 1.19 (1.01-1.40) 1.02 (0.52-1.97) | 0.57 (0.31-1.03) 0.74 (0.49-1.11) Reference 1.10 (0.75-1.62) 0.74 (0.27-2.06) |
| Koebnick 2008 [13] | USA | 1995-2003 (8y) | 61.2 | 471,760 | 1,719 | 8 | 18.5-24.9 25.0-29.9 30.0-34.9 ≥35.0 | Reference 1.21 (1.07-1.37) 1.21 (1.03-1.43) 1.25 (0.96-1.63) | Reference 0.84 (0.62-1.15) 1.38 (0.96-1.96) 1.37 (0.87-2.18) |
| Reeves 2007 [14] | United Kingdom | 1996-2001 (5.4y) | 55.9 | 1,222,630 | 615 | 7 | <22.5 22.5-24.9 25-27.4 27.5-29.9 ≥30 | 0.99 (0.83-1.19) Reference 1.14 (0.97-1.34) 1.15 (0.93-1.41) 1.07 (0.88-1.30) | |
| Holick 2006 [15] | USA | 1986-2002 (16y) | 48.8 | 162,535 | 866 | 7 | 18.0-22.9 23.0-24.9 25.0-26.9 27.0-29.9 ≥30.0 | Reference 1.11 (0.84-1.47) 1.14 (0.86-1.51) 1.12 (0.83-1.51) 1.01 (0.68-1.50) | Reference 1.04 (0.78-1.38) 1.23 (0.90-1.69) 1.09 (0.75-1.58) 1.31 (0.91-1.89) |
| Cantwell 2006 [16] | USA | 1980-1998 (15.3y) | 55.4 | 54,308 | 167 | 8 | <18.5 18.5-25 25-30 30-35 >=35 | 0.55 (0.14-2.24) Reference 1.05 (0.73-1.50) 1.28 (0.73-2.25) 0.83 (0.26-2.63) | |
| Samanic 2006 [17] | Sweden | 1971-1999 (19y) | 34.3 | 362,552 | 2,030 | 8 | 18.5-24.9 25.0-29.9 ≥30 | Reference 0.94 (0.86-1.03) 0.91 (0.76-1.09) | |
| Lukanova 2006 [18] | Sweden | 1985-2003 (8.2y) | 46 | 68,786 | 98 | 9 | 18.5-24.9 25.0-29.9 ≥30.0 | Reference 1.17 (0.71-1.94) 1.39 (0.64-2.79) | Reference 0.76 (0.26-2.02) 2.12 (0.77-5.43) |
| Rapp 2005 [19] | Austria | 1985-2002 (9.9y) | 42.2 | 145,931 | 229 | 9 | 18.5-24.9 25-29.9 30-34.9 | Reference 0.81 (0.59-1.11) 0.74 (0.45-1.22) | Reference 1.35 (0.74-2.48) 1.60 (0.76-3.36) |
| Oh 2005 [20] | Korea | 1992-2001 (10y) | 40.1 | 781,283 | 610 | 8 | <18.5 18.5-22.9 23.0-24.9 25.0-26.9 27.0-29.9 ≥30.0 | 1.76 (1.09-2.84) Reference 1.20 (0.99-1.45) 1.12 (0.89-1.41) 1.16 (0.83-1.61) 0.70 (0.22-2.19) | |
| Tripathi 2002 [21] | USA | 1986-1998 (13y) | NR | 37,459 | 112 | 7 | ≤22.89 22.90-25.02 25.04-27.43 27.46-30.67 ≥30.69 | Reference 0.88 (0.52-1.48) 0.66 (0.38-1.16) 0.58 (0.32-1.04) 0.53 (0.29-0.96) | |
NOS: Newcastle-Ottawa Scale; Q1~Q5: quartiles of exposures; NR: No reported.