Table 1. Sample size and dietary calcium intake of Chinese aged 18–64 years in 15 provinces (autonomous regions and municipalities) in 2015 (mg/d).
| 18–49 years old | 50–64 years old | 18–64 years old | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n (%) | Mean±SD | P25 | Median | P75 | P | n (%) | Mean±SD | P25 | Median | P75 | P | n (%) | Mean±SD | P25 | Median | P75 | P | |
| Gender | ||||||||||||||||||
| Male | 3102(46.8) | 378.0±187.2 | 249.7 | 341.3 | 465.4 | <0.0001* | 2520(47.5) | 394.5±202.5 | 251.6 | 354.8 | 481.5 | <0.0001* | 5622 (47.1) | 385.4±194.3 | 250.4 | 347.2 | 469.7 | <0.0001* |
| Female | 3528(53.2) | 348.9±188.7 | 222.1 | 311.0 | 423.4 | 2787(52.5) | 360.5±199.3 | 225.7 | 315.2 | 442.1 | 6315 (52.9) | 354.0±193.5 | 224.1 | 312.7 | 430.6 | |||
| Education | ||||||||||||||||||
| Primary school or below | 1160(17.5) | 335.4±186.7 | 212.3 | 293.2 a | 402.2 | <0.0001† | 1860(35.1) | 341.6±181.1 | 219.2 | 304.1 a | 419.8 | <0.0001† | 3020 (25.3) | 339.2±183.3 | 216.8 | 299.3 a | 412.7 | <0.0001† |
| Middle school | 2381(35.9) | 350.0±176.2 | 230.6 | 315.2 b | 428.6 | 1764(33.2) | 375.0±204.1 | 237.4 | 328.6 b | 456.2 | 4145 (34.7) | 360.6±189.0 | 233.5 | 320.0 b | 439.6 | |||
| High school | 1532(23.1) | 363.6±184.4 | 240.6 | 328.7 c | 439.8 | 1344(25.3) | 413.0±211.2 | 268.3 | 372.4 c | 509.7 | 2876 (24.1) | 386.7±198.9 | 252.0 | 346.3 c | 469.5 | |||
| University or over | 1557(23.5) | 400.8±205.5 | 256.1 | 360.3 d | 496.1 | 339(6.4) | 433.1±217.3 | 279.9 | 372.3 c | 530.6 | 1896 (15.9) | 406.6±208.0 | 261.4 | 362.9 d | 500.5 | |||
| Region | ||||||||||||||||||
| Urban | 1294(19.5) | 427.4±214.1 | 282.5 | 386.0 a | 526.5 | <0.0001† | 1234(23.3) | 437.0±225.2 | 277.5 | 385.9 a | 538.8 | <0.0001† | 2528 (21.2) | 432.1±219.6 | 280.3 | 386.0 a | 530.2 | <0.0001† |
| Suburb | 1146(17.3) | 370.6±180.5 | 247.1 | 334.6 b | 455.0 | 854(16.1) | 386.0±190.9 | 256.1 | 347.8 b | 461.8 | 2000 (16.8) | 377.2±185.1 | 250.2 | 339.9 b | 456.7 | |||
| County | 1286(19.4) | 346.9±170.5 | 230.6 | 319.7 c | 422.2 | 874(16.5) | 361.2±193.1 | 235.5 | 319.1 c | 448.5 | 2160 (18.1) | 352.7±180.1 | 232.9 | 319.3 c | 429.4 | |||
| Rural | 2904(43.8) | 337.3±180.0 | 217.9 | 300.3 d | 409.6 | 2345(44.2) | 347.2±187.5 | 220.1 | 307.5 d | 425.4 | 5249 (44.0) | 341.7±183.4 | 219.1 | 303.3 d | 416.5 | |||
| Household per-capita annual income | ||||||||||||||||||
| Low | 2140(32.3) | 355.0±192.2 | 223.6 | 315.3 a | 430.6 | <0.0001† | 1839(34.7) | 362.7±204.5 | 225.2 | 320.0 a | 443.6 | <0.0001† | 3979 (33.3) | 358.6±198.0 | 224.7 | 316.9 a | 436.7 | <0.0001† |
| Middle | 2217(33.4) | 349.7±181.4 | 232.7 | 313.2 a | 424.4 | 1762(33.2) | 364.1±187.3 | 236.0 | 320.1 a | 446.2 | 3979 (33.3) | 356.1±184.2 | 234.4 | 316.8 a | 433.0 | |||
| High | 2273(34.3) | 382.1±190.4 | 249.9 | 346.4 b | 472.8 | 1706(32.2) | 404.6±209.4 | 256.8 | 360.0 b | 500.6 | 3979 (33.3) | 391.7±199.0 | 252.8 | 350.9 b | 483.2 | |||
| Total | 6630(100.0) | 362.5±188.5 | 234.8 | 324.8 | 443.0 | 5307(100.0) | 376.6±201.5 | 238.6 | 332.7 | 461.0 | 11937 (100.0) | 368.8±194.5 | 236.4 | 328.3 | 450.7 | |||
*: Wilcoxon rank sum test of dietary calcium intake
†: Kruskal_Wallis rank sum test of dietary calcium intake
a,b,c,d: results of SNK(student-Newman-Keuls) test; different letters indicate significant differences between groups.