condition mean min max ZT0-3 10.518903 10.518903 10.518903 ZT4-7 16.0707375 16.0707375 16.0707375 ZT8-11 16.9544465 16.9544465 16.9544465 ZT12-15 16.8352975 16.8352975 16.8352975 ZT16-19 12.8439335 12.8439335 12.8439335 ZT20-23 11.63828 11.63828 11.63828