| C2 | C3 | C4 | C5 | C6 | C7 |
x | 21.59 | 17.93 | 17.60 | 18.05 | 18.52 | 18.12 |
s | 2.24 | 1.78 | 1.74 | 1.73 | 1.83 | 1.80 |
n | 2000 | 2000 | 2000 | 2000 | 2000 | 2000 |