condition mean min max ZT0-3 2949.919363 2949.919363 2949.919363 ZT4-7 2035.471573 2035.471573 2035.471573 ZT8-11 1631.268767 1631.268767 1631.268767 ZT12-15 1940.8337920000001 1940.8337920000001 1940.8337920000001 ZT16-19 3268.6217315 3268.6217315 3268.6217315 ZT20-23 2505.7920759999997 2505.7920759999997 2505.7920759999997