condition mean min max ZT0-3 0.10679476666666667 0.0183968 0.172981 ZT4-7 0.532851 0.532851 0.532851 ZT8-11 0.2849129 0.2849129 0.2849129 ZT12-15 0.333575 0.1976595 0.46949050000000003 ZT16-19 0.3052705 0.3052705 0.3052705 ZT20-23 0.12194050000000001 0.12194050000000001 0.12194050000000001