condition mean min max ZT0-3 69.897661 69.897661 69.897661 ZT4-7 25.599843 25.599843 25.599843 ZT8-11 100.995777 100.995777 100.995777 ZT12-15 155.922569 155.922569 155.922569 ZT16-19 263.37834150000003 263.37834150000003 263.37834150000003 ZT20-23 170.99102850000003 170.99102850000003 170.99102850000003