condition mean min max ZT0-3 5.0627025 4.814335 5.31107 ZT4-7 4.809755 4.809755 4.809755 ZT8-11 3.4120049999999997 3.4120049999999997 3.4120049999999997 ZT12-15 0 0 0 ZT16-19 5.80975 5.80975 5.80975 ZT20-23 5.03711 5.03711 5.03711