condition mean min max ZT0-3 6.3063666666666665 4.13153 10.65445 ZT4-7 18.4429 18.4429 18.4429 ZT8-11 5.33711 5.33711 5.33711 ZT12-15 11.25621 9.14947 13.36295 ZT16-19 6.401755 6.401755 6.401755 ZT20-23 4.307565 4.307565 4.307565