condition mean min max ZT0-3 12.11496 12.11496 12.11496 ZT4-7 11.339825999999999 11.339825999999999 11.339825999999999 ZT8-11 11.3652195 11.3652195 11.3652195 ZT12-15 10.072133000000001 10.072133000000001 10.072133000000001 ZT16-19 10.938614 10.938614 10.938614 ZT20-23 10.3410565 10.3410565 10.3410565