condition mean min max ZT0-3 2666.3 2666.3 2666.3 ZT4-7 3046.6 3046.6 3046.6 ZT8-11 3270.25 3270.25 3270.25 ZT12-15 3263.0 3263.0 3263.0 ZT16-19 3044.3999999999996 3044.3999999999996 3044.3999999999996 ZT20-23 2841.5 2841.5 2841.5