Characteristic | Overall | Underweight BMI | Normal BMI | Overweight BMI | Obese BMI | p value |
---|---|---|---|---|---|---|
<18.5 kg/m2 | 18.5-24.9 kg/m2 | 25-29.9 kg/m2 | ≥30 kg/m2 | |||
No. of subjects | 41021 | 1387 | 27519 | 10483 | 1632 | Â |
Age (years) | Â | Â | Â | Â | Â | Â |
 mean(SD) | 48(10) | 42(10) | 47(10) | 52(10) | 53(11) | <0.0001 |
 Median(Range) | 47(18-93) | 41(19-87) | 46(18-93) | 51(19-90) | 53(22-87) |  |
 ≤ 35 | 3737(9.11) | 390(28.12) | 2793(10.15) | 483(4.61) | 71(4.35) | <0.0001 |
 > 35 | 37284(90.89) | 997(71.88) | 24726(89.85) | 10000(95.39) | 1561(95.65) |  |
Tumor size (cm) | Â | Â | Â | Â | Â | Â |
 0 - 2 | 21931(53.46) | 827(59.63) | 15331(55.71) | 5083(48.49) | 690(42.28) | <0.0001 |
 > 2 | 19090(46.54) | 560(40.37) | 12188(44.29) | 5400(51.51) | 942(57.72) |  |
Axillary lymph node metastasis | Â | Â | Â | Â | Â | Â |
 Negative | 25205(61.44) | 916(66.04) | 17205(62.52) | 6153(58.70) | 931(57.05) | <0.0001 |
 Positive | 15816(38.56) | 471(33.96) | 10314(37.48) | 4330(41.30) | 701(42.95) |  |
Operation method | Â | Â | Â | Â | Â | Â |
 Mastectomy | 23362(56.95) | 759(54.72) | 15361(55.82) | 6254(59.66) | 988(60.54) | <0.0001 |
 Conserving surgery | 17659(43.05) | 628(45.28) | 12158(44.18) | 4229(40.34) | 644(39.46) |  |
ER/PR expression | Â | Â | Â | Â | Â | Â |
 ER and/or PR Positive | 28166(68.66) | 970(69.94) | 19065(69.28) | 7040(67.16) | 1091(66.85) | 0.0002 |
 ER and PR Negative | 12855(31.34) | 417(30.06) | 8454(30.72) | 3443(32.84) | 541(33.15) |  |
HER 2 expression | Â | Â | Â | Â | Â | Â |
 Negative | 28530(69.55) | 955(68.85) | 18995(69.03) | 7401(70.60) | 1179(72.24) | 0.0004 |
 Positive | 8005(19.51) | 265(19.11) | 5541(20.14) | 1917(18.29) | 282(17.28) |  |
 Unknown | 4486(10.94) | 167(12.04) | 2983(10.84) | 1165(11.11) | 171(10.48) |  |
Subtype | Â | Â | Â | Â | Â | Â |
 ER and/or PR + and HER 2 - | 21094(51.42) | 706(50.90) | 14179(51.52) | 5363(51.16) | 846(51.84) | <0.0001 |
 ER and/or PR + and HER 2 + | 4118(10.04) | 144(10.38) | 2909(10.57) | 929(8.86) | 136(8.33) |  |
 ER and PR - and HER 2 + | 3887(9.48) | 121(8.72) | 2632(9.56) | 988(9.42) | 146(8.95) |  |
 ER and PR - and HER 2 - - | 7436(18.13) | 249(17.95) | 4816(17.50) | 2038(19.44) | 333(20.40) |  |
 Unknown | 4486(10.94) | 167(12.04) | 2983(10.84) | 1165(11.11) | 171(10.48) |  |
Histologic grade | Â | Â | Â | Â | Â | Â |
 Low (grade1 - 2) | 20043(48.86) | 690(49.75) | 13495(49.04) | 5050(48.17) | 808(49.51) | 0.0032 |
 High (Grade 3) | 15890(38.74) | 498(35.90) | 10560(38.37) | 4186(39.93) | 646(39.58) |  |
 Unknown | 5088(12.4) | 199(14.35) | 3464(12.59) | 1247(11.90) | 178(10.91) |  |
Adjuvant chemotherapy | Â | Â | Â | Â | Â | Â |
 Yes | 28812(70.24) | 891(64.24) | 19289(70.09) | 7477(71.33) | 1155(70.77) | <0.0001 |
 No | 9682(23.6) | 409(29.49) | 6578(23.90) | 2320(22.13) | 375(22.98) |  |
 Unknown | 2527(6.16) | 87(6.27) | 1652(6.00) | 686(6.54) | 102(6.25) |  |
Adjuvant hormonal | Â | Â | Â | Â | Â | Â |
 Yes | 26265(64.03) | 856(61.72) | 17723(64.40) | 6651(63.45) | 1035(63.42) | 0.2424 |
 No | 12782(31.16) | 463(33.38) | 8501(30.89) | 3300(31.48) | 518(31.74) |  |
 Unknown | 1974(4.81) | 68(4.90) | 1295(4.71) | 532(5.07) | 79(4.84) |  |