condition mean min max ZT0-3 288.577891 288.577891 288.577891 ZT4-7 410.9417045 410.9417045 410.9417045 ZT8-11 1057.8847225 1057.8847225 1057.8847225 ZT12-15 620.759682 620.759682 620.759682 ZT16-19 633.6134995 633.6134995 633.6134995 ZT20-23 626.5773335 626.5773335 626.5773335