condition mean min max ZT0-3 10.542037 10.542037 10.542037 ZT4-7 10.138828 10.138828 10.138828 ZT8-11 10.4171435 10.4171435 10.4171435 ZT12-15 11.419505000000001 11.419505000000001 11.419505000000001 ZT16-19 9.2797385 9.2797385 9.2797385 ZT20-23 10.440243500000001 10.440243500000001 10.440243500000001