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Table 2: Sex-specific percentiles in the different age groups
Women (n = 527) Men (n = 469)
1st 5th 50th 95th 99th 1st 5th 50th 95th 99th
Midbrain area 
 50–54 yr (n = 121/91) 93 111 142 178 207 104 113 141 183 222
 55–59 yr (n = 187/159) 101 110 137 174 196 95 107 140 176 195
 60–66 yr (n = 219/219) 88 102 130 166 178 88 101 130 166 184
Pons area 
 50–54 yr (n = 121/91) 405 431 517 591 616 417 478 565 670 703
 55–59 yr (n = 187/159) 414 456 517 608 642 458 480 567 678 785
 60-66 yr (n = 219/219) 413 436 516 610 664 443 476 565 659 689
MCP width 
 50–54 yr (n = 121/91) 7.9 8.2 9.4 10.6 11.3 8.0 8.2 9.7 11.3 11.9
 55–59 yr (n = 187/159) 7.7 8.1 9.2 10.4 10.8 7.5 8.6 9.8 11.2 12.2
 60–66 yr (n = 219/219) 7.2 7.6 9.0 10.5 10.9 7.7 8.4 9.7 11.0 11.7
SCP width 
 50–54 yr (n = 121/91) 2.6 3.1 3.7 4.5 5.1 2.5 3.2 3.9 4.7 5.5
 55–59 yr (n = 187/159) 2.8 3.1 3.8 4.5 4.9 2.8 3.1 4.0 4.7 4.8
 60–66 yr (n = 219/219) 2.7 2.9 3.7 4.5 4.9 2.9 3.2 4.0 4.8 5.2
M/P ratio 
 50–54 yr (n = 121/91) 0.21 0.22 0.28 0.34 0.38 0.18 0.21 0.25 0.32 0.36
 55–59 yr (n = 187/159) 0.20 0.21 0.27 0.32 0.37 0.16 0.18 0.25 0.30 0.32
 60–66 yr (n = 219/219) 0.17 0.19 0.26 0.32 0.33 0.17 0.18 0.23 0.29 0.30
MRPI 
 50–54 yr (n = 121/91) 6.2 6.7 9.0 12.5 13.6 6.1 7.6 9.4 13.6 16.5
 55–59 yr (n = 187/159) 5.6 7.2 9.2 12.2 14.0 7.3 7.8 10.1 14.8 17.1
 60–66 yr (n = 219/219) 6.7 7.1 9.5 13.2 15.3 6.8 8.0 10.6 14.5 17.1
Note:—n = X/Y: X women and Y men.