condition mean min max ZT0-3 0.4903035 0.322805 0.657802 ZT4-7 0.828937 0.828937 0.828937 ZT8-11 0.65961 0.65961 0.65961 ZT12-15 0 0 0 ZT16-19 0.323691 0.323691 0.323691 ZT20-23 0.4875025 0.4875025 0.4875025