Table 4. The percentage of participants in the BTO Ringing Scheme by permit class. The chi-square statistics computed for each permit class were greater than the critical value at P = 0.05. Classes AP and CP are for those near retirement age in permit classes A and C, respectively (data on Trainers from Spence 2007).

Permit class %Male %Female X2 X2 N Unknown Skew
A 90 10 478 N/A 711 0 M
AP 95 5 395 N/A 466 0 M
C 74 26 163 N/A 650 2 M
CP 87 13 70 N/A 121 0 M
T 58 42 19 N/A 571 2 M
Total 80 20 969 N/A 2519 4 M
Trainers 95 5 316 10 373 0 M