condition mean min max ZT0-3 1.63904737475 1.563026147 1.7150686025000002 ZT4-7 2.2567436822499998 1.7461145085 2.7673728559999997 ZT8-11 2.9029728805 2.5257889205 3.2801568405 ZT12-15 3.6573395315 2.7170062164999997 4.5976728465 ZT16-19 2.86372752725 2.4169605005 3.310494554 ZT20-23 5.2817350672500005 4.454496708000001 6.1089734265