condition mean min max ZT0-3 1.8790200000000001 1.8790200000000001 1.8790200000000001 ZT4-7 2.05945 2.05945 2.05945 ZT8-11 1.211705 1.211705 1.211705 ZT12-15 1.86827 1.86827 1.86827 ZT16-19 1.823105 1.823105 1.823105 ZT20-23 1.82589 1.82589 1.82589