condition mean min max ZT0-3 9.446730249000002 7.466556828 11.426903670000002 ZT4-7 14.4618108295 10.145807204 18.777814454999998 ZT8-11 47.624515977499996 33.837130495000004 61.411901459999996 ZT12-15 35.7033962725 21.15411807 50.252674475 ZT16-19 12.435347407 9.367675984 15.50301883 ZT20-23 4.99136998775 4.417438686000001 5.5653012895