condition mean min max ZT0-3 0.19249016666666666 0.149008 0.2650435 ZT4-7 0.6947114999999999 0.6947114999999999 0.6947114999999999 ZT8-11 0.117775 0.117775 0.117775 ZT12-15 0.8961485 0.69521 1.097087 ZT16-19 0.315729 0.315729 0.315729 ZT20-23 0.4313705 0.4313705 0.4313705