condition mean min max ZT0-3 0.388382 0.35953199999999996 0.441247 ZT4-7 0.25641274999999997 0.25641274999999997 0.25641274999999997 ZT8-11 0.653573 0.653573 0.653573 ZT12-15 0.555804925 0.5378825 0.57372735 ZT16-19 0.4925775 0.4925775 0.4925775 ZT20-23 0.785231 0.785231 0.785231