condition mean min max ZT0-3 17.57535 17.57535 17.57535 ZT4-7 14.7966415 14.7966415 14.7966415 ZT8-11 16.313571 16.313571 16.313571 ZT12-15 18.183867 18.183867 18.183867 ZT16-19 17.9413315 17.9413315 17.9413315 ZT20-23 16.2996315 16.2996315 16.2996315