condition mean min max ZT0-3 1069.675431 1069.675431 1069.675431 ZT4-7 704.0467140000001 704.0467140000001 704.0467140000001 ZT8-11 751.8759665 751.8759665 751.8759665 ZT12-15 886.108648 886.108648 886.108648 ZT16-19 1023.0752855000001 1023.0752855000001 1023.0752855000001 ZT20-23 1212.9363720000001 1212.9363720000001 1212.9363720000001