condition mean min max ZT0-3 4.2108664825 2.902564103 5.519168862 ZT4-7 9.68813875875 7.859601252500001 11.516676265000001 ZT8-11 16.563211008499998 12.656673072 20.469748945 ZT12-15 10.87568997 7.2032693135 14.548110626499998 ZT16-19 3.50090884625 2.7696771645 4.232140528 ZT20-23 2.20955220875 2.104678711 2.3144257065