condition mean min max ZT0-3 9.472132 9.472132 9.472132 ZT4-7 10.690573 10.690573 10.690573 ZT8-11 10.4175285 10.4175285 10.4175285 ZT12-15 10.6268545 10.6268545 10.6268545 ZT16-19 10.0345385 10.0345385 10.0345385 ZT20-23 10.146619 10.146619 10.146619