Table 2. The dose of different protein consumption of included studies.
| Study | Total protein | Animal protein | Vegetable Protein | Quartile | |
|---|---|---|---|---|---|
| Mussolino et al. 1998 (g/day) | highest dose | >98 | - | - | Q4 |
| lowest dose | <56 | - | - | Q1 | |
| Beasley et al. 2014 (g/day) | highest dose | 20% increased | - | - | |
| lowest dose | - | - | - | ||
| Meyer et al. 1997 (g/day) | highest dose | - | >20.6(Woman) >21.6 (Man) | - | Q4 |
| lowest dose | - | <13.6(Woman) <14.2(Man) | - | Q1 | |
| Misra et al. 2011 (g/day) | highest dose | 82.74 ± 10.27 | - | - | Q4 |
| lowest dose | 46.45 ± 7.29 | - | - | Q1 | |
| Thorpe et al. 2007 (Eight level food frequency) | highest dose | >1/day | - | - | Q3 |
| lowest dose | <3/week | - | - | Q1 | |
| Nieves et al. 2010 (g/day/kg) | highest dose | - | 1 g/day/kg increased | 1 g/day/kg increased | - |
| lowest dose | - | - | - | - | |
| Zhang et al. 2005 (g/day) | highest dose | - | - | >13.27 | Q5 |
| lowest dose | - | - | <4.98 | Q1 | |
| Munger et al. 1999 (g/day) | highest dose | >95.5 | >75.14 | >26.2 | Q4 |
| lowest dose | <67.38 | <43.74 | <17.5 | Q1 | |
| Sahni et al. 2010 (g/day) | highest dose | - | 68 | 29 | Q3 |
| lowest dose | - | 38 | 18 | Q1 | |
| Feskanich et al. 1996 (g/day) | highest dose | >95 | >80 | >19 | Q5 |
| lowest dose | <68 | <51 | <12 | Q1 | |
| Dargent-Molina et al. 2008 (g/1000 kcal) | highest dose | >50.11 | >33.52 | >14.12 | Q4 |
| lowest dose | <40.75 | <22.42 | <10.07 | Q1 | |
| Key et al. 2007 (g/day) | highest dose | >90 | - | - | Q5 |
| lowest dose | <55 | - | - | Q1 |