condition mean min max ZT0-3 1.97106 1.97106 1.97106 ZT4-7 2.0100100000000003 2.0100100000000003 2.0100100000000003 ZT8-11 3.780565 3.780565 3.780565 ZT12-15 2.8528100000000003 2.8528100000000003 2.8528100000000003 ZT16-19 2.69605 2.69605 2.69605 ZT20-23 0.6685814999999999 0.6685814999999999 0.6685814999999999