condition mean min max ZT0-3 7.366298333333333 5.02586 10.514479999999999 ZT4-7 9.40158 9.40158 9.40158 ZT8-11 9.929565 9.929565 9.929565 ZT12-15 14.344275 12.705400000000001 15.98315 ZT16-19 11.082385 11.082385 11.082385 ZT20-23 9.723099999999999 9.723099999999999 9.723099999999999