condition mean min max ZT0-3 5.576605 5.576605 5.576605 ZT4-7 7.00143 7.00143 7.00143 ZT8-11 2.08888 2.08888 2.08888 ZT12-15 1.168565 1.168565 1.168565 ZT16-19 1.914495 1.914495 1.914495 ZT20-23 3.456755 3.456755 3.456755